A3 i think would be the natural choice but their earn rate is pretty variable. I have built up status with UA and I like it for the UDU, the earn rate and MFU. Its not a perfect program - copay for MFU and 150% and the cut in bonus to 50% from next year but it works. I will also miss the ability to use lounge access when travelling domestically, as I did just this with my DC card here in Denver now. I guess some of it also depends on what BA does, what travel patterns we have, and what others in *A do to status match.