I booked a one way with UA miles before US became oneworld for 30k BOS - CLT - GIG and was able to secure some pretty nice seats up front.

AA has release a lot of saver availability and there is a flight BOS - JFK - GIG that gets in about 45 minutes earlier, however, I don't have status and would be near the end of the plane, which isn't that big of an issue for me.

My big question is, is there a dramatic difference in service between AA & US? I know AA is nickle & diming everything, I flew them a couple of times internationally, but I have never flown US outside of my rather poor experience domestically.

Granted that everything stays the same (miles needed, flight times, etc) and that the only difference is the carrier, what does flyertalk recommend?