Right off the bat, we will notice that the cases of the CX Plus SE and Sport True Wireless looks identical, with the Sport True Wireless case being the larger of the two as it needs to house the bigger earbuds as well as its detachable ear wings. Meanwhile, the Momentum True Wireless 3 case take on an improved and smaller design of its predecessors. The 3 cases share a similar style of top opening to remove the earbuds from the case with the earbuds docking in fairly easily and will not fall out when the case is flipped since there are magnets inside to keep them secure. Notably, all cases have LED indicators outside to let users know the charge status of the case and earbuds. In terms of durability, the Momentum's case definitely one of the strongest cases out there, protecting well against scuffs and accidental drops with its fabric finish, while the CX Plus SE and Sport's case seems a little fragile such that it picks up scuffs from other items knocking against the matte plastic build. It also feels very hollow and may not survive well with drops. One added feature to the Sport True Wireless case is a slot for you to hang the included long lanyard anywhere from gym equipment or to the side of your bag. There is a USB-C port at the back of the case with a rubber cap to cover up the port to prevent water ingress, indeed a well-thought feature for a sports earbud. Moving on to the earbuds, the Momentum's have a refined builds that fits nicely into my ears and does not stick out much. The new slightly rectangular design isn't the smallest but it fits well into most ear shapes and sizes. After listening for an hour or two, it is quite easy to forget that you have them in. On the other hand, the CX Plus SE and Sport share similar builds with the usual rectangular shape. And that simply means that their design has been tried-and-true to promise a secure fit. Do note that the Sport True Wireless earbuds shape is slightly larger than the CX Plus SE, so its quite difficult to forget that they are in your ears. The Sport's also houses additional ear fins to keep it stable for sports but for my use case, I had to swap out the originally fitted ear fins to use none at all as the wings do hook into your ears pretty deep causing wearing fatigue after an hour or so. Personally, having no ear-wings on for my gym use proved to be okay as the earbuds are lightweight enough for light exercises. If I were to take on more intense sports like running, I would pick out the small size ear fins to keep it stable but at the expense of having wearing fatigue after an hour. There are ear fin included in the Momentum's package too if you wanted to use it for sports, however do note that the CX Plus SE does not come with any. As usual, Sennheiser went ahead with touchpads for all models so the experience feels responsive even when you tap them lightly or with wet hands. It is also worth mentioning that the touch controls can be customised to any command in the Smart Control app and the settings will sync immediately. If you need to pair another device, you can hold down both earbuds for 3 seconds to enable Bluetooth pairing. All earbuds bear the Sennheiser logo and have subtle LED indicators on the inside that will only light up when necessary such as in situations of pairing them. In normal usage of music playback or calls, they never light up to attract unwanted attention. In the box, there are extra sizes of silicone ear adaptors and ear fins for the Sport's and Momentum's to ensure a tight seal and secure fit. The Momentum's are offered in 3 colours, Graphite, Black and White, while the Sport's and CX Plus SE in one colour of Black only. In terms of water-resistance, we're looking at IP54 dust, water and sweat resistance for the Sport True Wireless and a standard IPX4 for the CX Plus SE and the Momentum's.

Next, Sound Quality. In my opinion, I find that the sound of all 3 models are very similar and that is because they all use Sennheiser's signature 7mm TrueResponse transducers. In short, I would describe the bass to be deep, punchy, and tight. It never managed to distort at loud volume and never bleeds into the mids when it is at a low volume level. Thanks to the continuous refinement over the years, the highs sound bright and forward with plenty of details. The mids do sound extremely crisp especially with the help of the equaliser tuning that is found in the Sennheiser Smart Control app that really help to configure the sound to your ears. The soundstage is indeed the widest I have heard from any earbuds on the market today and nothing comes close to it. The instrument separation is excellent with distinct left and right channels being heard clearly. If you are not so much of an EDM or Hip-Hop fan, I am glad to report that the all earbuds works perfectly with all other genres ranging from Pop to Jazz after you fiddle with the customisable sound settings in the Smart Control App available for download from the App & Play Store. In the app, you will first see the My Devices page where you can select which compatible Sennheiser device to delve into. Thereafter, you will be greeted with the selected devices' settings where the battery life status is shown as well as the option to manage your earbuds' connections to your devices. Next, there is the Equaliser setting which you can choose to customise your very own or choose from the presets. There are presets like Rock, Pop, Dance, Hip Hop, Classical and Movie. Different presets do work well with different music genres and I personally prefer the Dance preset. You may also select any presets available and further tune and rename it to become your custom setting. Additionally, there is the Bass Boost option which I greatly enjoyed using to boost my low frequencies as well as the Podcast mode where the equaliser will be disabled fully and set to Sennheiser pre-made Podcast mode. Should you happen to mess up doing custom presets, a simple tap on the Restore all Sennheiser presets will revert all changes made. Specific to the Sport True Wireless, there are 2 different ear adaptors with the first being the standard closed ear adapters with a black cross inside. When used with this particular set of ear adaptor, 'Focus' mode minimises surroundings noises for passive noise isolation and allow for maximum seal for full music immersion in safe and controlled environments like the gym or running on a treadmill. Next, there are the open ear adapters with blue marking inside that is to be used with 'Aware' mode in cases of running in outdoor environments that you need to be more aware of surroundings such as traffic noises as well as helping with reducing body borne noise such as breathing, footsteps and clothes rattling. In my experience, I found it to open ear adaptor to be useful for my outdoor running use case. Of course to round up the listening experience, Sennheiser has also introduced new modes to control the sound signature when used with different ear adaptors. With the 'Aware Mode' and open ear adaptors, the overall loudness in volume, mimicking the experience of having a portable speaker playing music as you run. Since it is more of an open sound, the bass does get bloated somewhat like what you hear on the outsides of the club. The mids do take a backseat and isn't as forward as it is in Focus Mode. While the highs do lose some clarity, it may be sound a little sharp when you listen to it near maximum volume. To switch back to for the immersive and sealed experience, you would need to use the closed ear adaptors as well as set the mode to 'Focus'. Since there are two types of ear adaptors, the option to change the adjustable acoustics is shown in the Sport True Wireless app with the need for you to switch the modes on your own. There ain't no fancy advanced 'ear adaptor detection' that can do so without the app, therefore you are literally stuck on whatever mode you have set previously if you happen to pair it with your smartwatch for music playback. Back to the app, you can further take this experience deeper using the Sound Check feature where you can play your favourite songs in the background while you choose from the 3 options in the low, mid and high frequencies that the app boosts to compensate for your hearing needs. Personally, I find that amongst the 3 options of A, B and C, I could hardly tell a difference, but you will definitely hear a slight difference in the sound if you pay attention and listen closely. At the end of it, I couldn't tell a huge difference before and after I use the Sound Check feature. Well, some additional tuning is definitely better than nothing, I guess. 

Moving on to the next part, Noise-Cancelling. This part only applies to the CX Plus SE and the Momentum True Wireless 3. The Sport True Wireless does not have active noise-cancelling, only passive noise isolation. Back to the Smart Control app, we have the Transparency Mode option. This option is only found on the CX Plus SE and Momentum's, the Sport True Wireless uses another type of adaptable acoustics to achieve non-software based transparency as mentioned previously. On the more premium option of the Momentum's, you can change the setting from Low, Mid and High levels so you can find the middle ground between mixing in your environment and your music as well as setting its mode from Off to using it With Music or enable Pause Music to stop the music every time you enable it. Transparency Mode allows you to hear your ambient surrounding sounds so you can always hear the next train announcement or traffic noise to stay safe. Adaptive Noise Cancellation is next with the simplest option of all, just a simple Off, Anti-Wind or On. No advanced customisation here since Sennheiser have specially tune it to simplify the process for the end users. Comparing the ANC performance of the Sennheiser's, I found that the Momentum True Wireless 3 is much better than the CX Plus SE at consistently filtering out higher frequencies as it features adaptive ANC instead of the standard fixed ANC on the CX Plus SE. Next, you will then see the newest feature here found on all earbuds, known as Sound Zones where the app will automatically switches to a certain equaliser and ANC or Transparent Hearing setting when it detects that you have reached a frequent destination like your office, school or at home. You can set up to 20 different zones and each can be from a close radius accuracy of 100m to 1km from the selected location. The Noise Control settings will tap into existing equaliser presets that you have and you will need to set what happens when you arrive and leave the location. Personally, I don't use this feature as it can be quite gimmicky as well as making it a great way to give away your location to Sennheiser too. Back to Home page, you can enable or disable the Touch Controls or switch SideTone from Off, Minimum or Maximum. SideTone is basically how loud you would like to hear yourself in your earbuds when you talk to another party over the call. Onto the Discover tab, you can read and catch up on the latest Sennheiser press release and news where they will share their latest product offerings and possibly entice you to buy them? In all case, its possibly the least important and useful feature in the app. In the settings, you can enable Smart Pause if you prefer the faster way of removing one earbud to pause the music to hear someone but it is only available on the CX Plus SE and Momentum's. You can also enable the ability to auto accept calls when the earbuds are removed from the case as well as set the duration for auto power off ranging from 15 minutes to an hour. Lastly, you choose to use both tones and voice prompts, use tones only or just turn it off completely. At the bottom, a factory reset of the app settings is possible together with the ability to show or hide the individual tiles on the homepage. You can easily check the current codecs used or the model name too. In terms of call quality, the Momentum True Wireless 3 uses 3 beam-foaming mic array per earbud to capture your voice while eliminating ambient noises, its quality is pretty usable though in some cases very strong winds or loud traffic noise does affect its quality and lowers the voice pickup. Meanwhile, the Sport True Wireless and CX Plus SE uses the same 2 beam-foaming mic arrays of 4 mics to capture your voice. In my opinion, the quality is can be easily affected by wind or traffic noise and my voice does sounds a little robotic and muffled. 

In the connectivity department, as mentioned, all earbuds can be used in mono mode as they use an independent connection to your device. However, none of them feature Bluetooth Multi-point, therefore you can only connect to one device at any one time. The earbuds connectivity to the app is perfect as it is able to detect my device when its already connected via Bluetooth all the time. If you try to watch videos or movies with these, they do not have any latency in audio transmission, since they all support Bluetooth 5.2 and support the latest AptX, AptX Adaptive, AAC & SBC codecs. Comparing battery lives, the Sport True Wireless has a promising 9 hours per use and up to a maximum of 27 hours with the case, while the Momentum's have up to 7 hours per use with ANC and a maximum of 28 hours with the case. Meanwhile, the CX Plus SE peaks at 8 hours per use with ANC and up to a maximum of 24 hours with the case. All earbuds do charge via USB-C and feature quick charge where a 10 minute charge gives you up to 1 hour of playback. It takes about 1.5 hours to charge both the case and the earbuds from a dead battery. Alternatively, you can charge the Momentum True Wireless 3 via a Qi Wireless charging pad. The less premium options of Sport True Wireless and CX Plus SE does not support it unfortunately.

Overall, all 3 earbuds come at very different price points and have very different target audiences. Now, let's recap and break down the differences to further understand which is the best for your ears. First, the Momentum True Wireless 3 is the most popular amongst those who have the budget to afford it. It has the best sound quality, adaptive noise-cancelling as well as loads of features like Qi Wireless Charging and superior call quality, fixated on targeting frequent travellers. Next, the Sport True Wireless is the earbuds aimed squarely at appealing to gym-goers and exercise junkies. With customisable sound, familiar app interface and long battery life, it drops the Transparency Mode and Active Noise-Cancelling features for a different type of unique acoustics that seem over-engineered. I could still see a niche group of athletes and sport enthusiasts potentially enjoying these feature but for the rest of us, I would recommend the CX Plus SE being the better buy. With the signature Sennheiser sound signature, decent noise-cancelling as well as overall user experience. It is indeed a seamless and hassle-free experience that Sennheiser has nailed after going through a few iterations of perfection. The Sennheiser CX Plus SE bring the more cost-effective option to the Momentum True Wireless 3, cuts out the some premium features to keep the price low but letting us experience the full potential behind what is needed for a simple and straightforward everyday earbud.