Fit: headband1. PX72. IO63. M3PX7 headband has a longer range of padding than IO6, but the plastic portions on the IO6 do not come into contact with your head due to the angle.. M3 has less passing than both.Adjusting the headband is better on PX7 and IO6 because of the grippier movement. The over-the-top headband of the M3 is loosest and I often ended up with an imbalanced headband.ANC1. PX72. M33. IO6PX7 is much better than M3 on Auto and High. PX7 especially is night and day compared to IO6. In fact it‘s barely noticeable on the IO6. In the PX7 thread someone mentioned wind noise on High but not on Auto. In the box or app tutorial it notes that High is best for consistent noise such as aeroplane. Also, no adjustability for IO6. Likewise the M3 apps has low ear pressure mode equivalent to Auto, but I never felt any pressure on High. The IO6 box says “immersive noise-cancelling” but it really isn’t.Passive isolation1. IO62. M3 (not 100% sure though)3. PX7IO6 has best passive isolation. M3 was probably very slightly better than PX7. PX7 isn’t terrible though.