The short answer
Buy the Sony WH-1000XM5 for the best silence and longer battery. Buy the Bose QuietComfort Ultra if all-day comfort and foldable portability matter more to you. Both are legitimately great — this is a preference decision, not a quality gap.
Where the Sony pulls ahead
Stronger measured ANC, six extra hours of battery, and a lighter frame. For frequent flyers, the Sony’s low-frequency cancellation is the deciding factor.
Where the Bose wins
The most comfortable fit we’ve tested, foldable travel case, and slightly clearer call quality. If you wear headphones for eight-hour stretches, comfort compounds.
Bottom line
Silence and stamina → Sony. Comfort and portability → Bose.