Sennheiser MOMENTUM True Wireless 3 vs Sennheiser MOMENTUM True Wireless 4

The Sennheiser MOMENTUM True Wireless 4 are better by most metrics than the Sennheiser MOMENTUM True Wireless 3, but not by an enormous margin. Updates to the 4 include better noise cancelling that reduces more midrange noise like ambient traffic din and low-humming HVAC units. They're also slightly more futureproof with the Auracast feature, which isn't widely supported but allows you to receive local Bluetooth audio over open feeds, such as airport announcements. They have added dust resistance with an IP54 rating. On the other hand, the 3 have a slightly longer battery life, and you can use multi-pair to connect to up to three devices rather than just two on the 4. However, while their noise isolating is good, it's not as effective.