I just recently flew overseas on Lufthansa for my first time. I flew in First Class on a Mileage Plus award which was an incredible experience. (However I like the beds in British Airways much better.)
Anyway, I took a peak into the coach cabin. The seats looked very comfy for coach. Also,
as someone else noted, the foreign carriers
always seem to have better service.
I think I would LH over American.
Neal