Originally Posted by
misjinks
I am, at this point, inclining slightly to AA, because as Jenbel and Crystak point out, upgrading and redemption in AA are cheaper, and that's more important to me right now than cabin comfort. (Also I am like 5" and all airline seats seem fairly decently sized to me). I'll also, because of my job (research) be travelling a lot, and doing the Platinum challenge seems entirely feasible.
I'd apply a caveat. For all AAdvantage members bar Executive Platinum card holders, upgrading on AA is not inexpensive - upgrades from economy to business class are subject to hefty fees and additional government taxes. Purchasing WT+ fares and upgrading with BA Miles is often no more expensive. BA also offers customers opportunities to proactively purchase cash upgrades into the next cabin.