If I was younger I'd apply to BA, just for the career and the options it offers. Life isn't all about money.
However my friends in BA regularly do 900 hours longhaul. Quite what the medical implications of long term deep night and multiple timezone changes over a potential 30000hr career is going to be interesting.
Not sure how many hours they average on shorthaul at LHR?
However I'm not young anymore, LHS and like being home pretty much everynight so I'll stick with what I've got.....