We flew JFK-AMM in 3E and 3F, and flow AMM-ORD in 1A and 1B.

Personally, I liked 1A and 1B much better. With no seat in front of you there is slightly more legroom since the "head" of the window seat in front of you impedes on the legroom in rows 2, 3, and 4.

In addition, seat 1C and 1D are back a little to make room for a small counter and storage area, so 1A and 1B are even more isolated.

Overall, I very much enjoyed the experience. The headphone and charging jacks are a bit hard to reach behind your head, but the seat is very comfortable and the service was very good.