Honestly, aside from VX, they're all pretty similar.
Well, I would qualify that a bit: AA, UA and DL's JFK-CA transcon service are pretty competitive with VX, plus you can score 3-class metal on AA and UA that also is competitive (or even better), plus the occasional longhaul repositioning flight on DL and CO that AS doesn't have.
But unless you're able to pick and choose planes accordingly to stay off of single-aisle planes, or flying a lot to and from JFK, the F you get on the majors is pretty comparable to the F you get on AS.