For me, the 320 is the best. Seat 2A on the 320 is my favourite non-pod seat in the fleet. It's a window seat with no one in front of you, it has space under the coat closet to put a carry-on, and there is so much space that I can get up without the person in the aisle seat having to get up as well.

Same seat on the 319 does not have the under-closet space for carry-on.