Sennheiser - Momentum 5 Wireless vs Sennheiser - HD 660S2

The Momentum 5 Wireless is the clear pick on raw spec strength, leading by 12.5 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.

Pick the Momentum 5 Wireless if audio quality and feature breadth (ANC, codecs, multipoint) are the lead criteria for your purchase. The biggest gaps in its favor are driver size, active noise cancellation, multipoint, among others.

Pick the HD 660S2 if you carry the device everywhere and weight or thickness has been the deciding factor before. Its strongest claims are weight.

Both ship with comparable spatial audio, water resistance, so those specs don't separate the two — focus on the differences below.

Bottom line: the Momentum 5 Wireless is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.