Flew long haul for 6.5 years, totally knackered and v.v fatigued... heaven was two weeks in the same time zone! Spent the past 10+ years with the Orange Order, some weeks honestly tired from too many earlies, sometimes fatigued from 20 sectors in five days, but never as bone numbingly knackered as from long haul with its Jet Lag and fatigue. Yes, sometimes you fly 20/5, but never all f*%@g year round! Remember, mud is the same consistency on both sides of the fence.
Having said that, If I were a lot, lot younger (max late 20's), then I'd still go for the BA option. Anything later, get your jet command, then if you're really bored, go for expat command (Korean, Etihad etc..), but don't expect to come home when you've had enough.
easy