I rode the subways of NYC, out and about all day, wearing closed-back over-ear headphones, wired to my iPhone via a DAC. Great sound, and not bad on the subways, but def not great due to the LOUD noise. I realized I really want noise-cancelling headphones. I want to see a few things happen w/ AirPods Max for the next gen before dropping serious $ on them:
1 - on/off button
2 - most importantly - the ability to play hi-resolution files, or at least CD-quality. If Apple can crack the bluetooth code for hi-res, it will be a game-changer. Otherwise, if wired, I want the noise-cancellation to work with it.
3 - A real case. Nothing fancy, just a damn case to put them in.