Probably in the short term you'll make more at Jestar, because by the time you go from S/O to F/O at QF you'd have gone from F/O to CAPT at J*. Longterm however, always be better off at Qantas. It's a matter of what suits you or whom you can get into, not all pick and choose for some.
Not all want to be old and wrinkled by the time we earn 250+