I got the QC35. I also have the Sennheiser Momentum Wireless 2.0 (AEBT), already for about 8 months.
I bought the QC35 because the AEBT put a painful pressure on my left ear after 1-2hrs of listening and because I the 2,5mm jack is recessed, which prevents me from using a 2,5 > 3,5mm adapter to plug a boom mic (V-Moda Boom Pro mic).
Subjective aesthetics and sound quality points aside, these are my observations when compared to the Sennheiser:
Pros:
- More comfortable
- Better noise cancelling, though not much better but I'll take all I can get. Test conditions: I have a school next to my office and have kids talking loud and screaming all day long. This gives an impression of performance with random human voices. I also have a fan to give an impression of constant noises (representative of an aircraft sound).
- Folds into more robust and compact case - I’m happier to carry the Bose around compared to the Sennheiser
- Ability to manage paired devices via the mobile app
- Compatible with 3rd party 2,5mm jacks, unlike the Sennheiser (unless you hack it, but still limited to hole's width)
Cons:
- Can't use NC while charging. The Sennheiser work while charging which is a big plus for me. Now the Bose will give me charge anxiety
- Passive wired performance not as good as active. You feel it immediately in the bass. The Sennheiser offer no shortcomings when used passively on wire.
-
Noise floor noticeably higher when active. To me this is only a con because they make it more noticeable you’re wearing the headset when not playing music (useful when you just want to cancel outside noise). I have to pay attention in order to feel the little noise that the Sennheiser make when active (but not playing).
- The Bose noise cancelling make this weird air/sound pressure in your ears. The Sennheiser have none of that.