I'm an AA Platinum & UA 1K (pe in the past) and I would say AA is a little better. However with that said, if I lived in D.C. I would stick to United, unless you plan to connect to just about everywhere vs. a non-stop out of IAD. I think that I would have to live near DFW, SJC, LAX, MIA, ORD or STL to go with AA exclusively.
------------------
Ken in Sacramento