I don't think US domestic F service gets enough credit, ignoring things outside of the crew's control, like equipment (I like AA aircraft) and pre-merger standards. While my 'best ever' experience between AA/US has been on AA, I've found US to be more consistent, and consistently a bit better. Sometimes I think I get the same number of unprompted refill offers on, say, a US PHL-BOS as I do on an AA DFW-PHL.