If sitting in the back watching someone else do all the good stuff and you only aspire to work at QF, then by all means... remember it's SO time in your logbook.
Your mates or colleagues who did not want QF or could not get a job at QF will be logging FO time on 737/A320.
Which insurance policy out of the two options would you consider the best bet?
Speaking from life experience I guess.
L.B