My AA miles from a TP purchased on 7/25 posted overnight. I needed AA miles for a specific redemption I had on hold and they came through in time.

Now I want to buy one more TP, purely on spec with no destination in mind, but can't decide what airline to use. All my current miles are with AA and BA, but I have enough Avios to last me quite a while. So I'm considering AS and UA. Being DC based, I guess UA makes sense, especially given the 10% Marriott bonus for UA, but the last time I had significant UA miles many years ago, award inventory sucked. I know AS is supposed to be the best value, but is that true from the DC area? Oh, and I'm only interested in flying up front, in Business or First Class.