Without a doubt, using QF on the U.S. transcon segment is a nice way to do LAX-JFK or vice-versa, but the alternative, AA in F on a three-class flight is really quite nice for a medium length flight within the U.S.. If you select a lunch or dinner flight, the standard of the in-fligth service will be high. My experience in F on this route is that FAs "get it" that they are carrying mostly paying premium pax and make an effort to provide excellent service.
Personally, I would stress over the QF option when the AA option is perfectly acceptable for the length of the flight.