Originally Posted by
Otterbox
AA has better reserve rules and United uses their bus for 3-4 leg/day RJ flying. That will change as the 321s come online and replace the 757 flying, which will subject it to global reserve rules allowing for only 6 hard days off per month. If you want want easy bus flying, and sleeping in your bed and not a relief seat, AA may be the place for you.
I ran into an AA buddy last winter and he took his first available upgrade at 21 years and UA has unfilled CA vacancies in DC every bid. I've heard AA has had their upgrade times come wayyyyy down but I don't think they have 1 year CAs in DC or will anytime soon like UA does. While WB fying isn't on your priority list, you will have the option at UA but would never have that option with AA. UA is the clear winner IMO