Cockpit seats,head rest and arm rest-A320(arguably) more luxurious
Deck room..roomier , wider and higher ceiling in A320..also quieter cockpit
I have had a try of both and much prefer the Boeing seats (even though they are not electric). Airbus armrest is better.
Yes Airbus is much roomier, but the noise level is deafening (seems to be mostly air conditioning noise).
In most other respects they seem to be very similar.