As someone who's flown UA only a few times lately, I don't see much of a difference between US and UA in Y (E- on UA). In fact, one of the worst flights of my life was on UA (being crammed into E- for BOS-SFO). Besides a better FC (and better is all relative, some people don't care about drinking out of plastic cups) and ignoring the SWUs/CP level, what other real in-flight features are better on UA?