I like 2A myself. Lots of room, but you can still throw a bag under the seat in front of you. I like having access to my bag without getting up.
I sat in 3A on an E75 last weekend and it was fine. Limited recline, but I rarely recline anyway. Lots of leg room (I'm 6'), especially if you don't put a bag under there.
The D/F seats are far enough apart, too, that they're quite nice, but I like the A seats if I fly on my own, if I can get one (and I am lucky enough to be at the front of the bus).
Same story in the E90 by the way.