I'd prefer VX coach on an exit row than UA first in an A319. I'd rather spend less on the ticket and buy my own food. You don't have a stupid bulkhead and there is plenty of legroom.
I'd also prefer google maps than channel 9 and Red than getting fussed over by some butler-like purser (I'm not pompous and don't have a superiority complex). I like the VX seats better too. The staff are friendlier. Can't wait for the Internet!
Priority lines for *G are nice though. Lounge is good when flying international. But I can do without the lounge.
I only fly UA because VX doesn't service my routes. Where possible I fly VX.