I like everything about the 319 better than any UA 737. Newer=nicer interior, better IFE, better galleys (and no chance of a non-galley ex-SHT a/c), better Y seats (newer design and 18" vs 17" width). In fact, except on a packed flight with a COS in the middle next to you, E+ on the Airbus is darn near as roomy as F and very, very comfortable, so upgrading on the 319 isn't nearly as important to me as on the 73's.