Say Mach Number has the argument cracked.
5 1/2 years of easyJet left me knackered and with some heavy relationship issues to sort out-the only way I could do this was to leave.
If you can put a veneer of order on your life-you may just survive the LoCost sector-it is relentless, but I always felt I could have made it long term if my roster did not change so much-I had more stability flying ad hoc charter.
So if FRA pay well and stick to 5 on 3 off then that, believe me, is worth more that it might first seem.
Good Luck