Sennheiser - Momentum True Wireless 4 vs Bose - QuietComfort Ultra Earbuds 2

The QuietComfort Ultra Earbuds 2 edges ahead on the Mars Score (54.1 vs 58.4), but the 4.3-point gap is small enough that the right pick comes down to which spec advantages matter to you.

Pick the Momentum True Wireless 4 if your top frustration with your current device is running out of charge before the day ends — endurance is the lead spec here. The biggest gaps in its favor are battery — buds, battery — with case, water resistance.

Pick the QuietComfort Ultra Earbuds 2 if you care most about driver size. Its strongest claims are driver size.

Both ship with comparable active noise cancellation, weight per bud, spatial audio, so those specs don't separate the two — focus on the differences below.

Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity tells you both are well-rounded; the differences are about trade-offs, not quality.