Thanks for the reply.

I know that it pretty much will be economy booking (but I can choose the airline). Corporate AMEX to pay for it.
I enjoy perks when I fly, and I've felt I've gotten that on United, but I hear people say AA treats elites better. I'm not sure what the specifics of that is though.

I will book my own travel and there aren't preferences to one hotel/car chain or airline, my choice really within cost.

Mostly I'll be traveling ORD to Boston, NYC, D.C., NC, Dallas, banks usually.

I have both the Chase UA Explorer and the Citi AAdvantage - have had status on both previously but liked the schedule of UA more.

How is AA better to elites? I've never had an issue with upgrades on UA, and enjoy the booking/sdc flexibility as well as the app. Is AA good in those areas?

Right now I see myself staying UA and Marriott/SPG - but I could be swayed.