I would suspect there is little difference in company cultures from what I have read about QR, but at least with RYR you live in a continent, whichever base you get, where you have plenty of rights and protections. You will also get a fairly good roster, unless you have to commute to a base away from home on days off, and the vast majority of your colleagues will be amiable and sociable on and off duty. I don't know how QR compares on that front, so make no judgement at all there, but it's one thing you don't need to worry about with RYR. From what I have read, but I stress not experienced, about QR, I'd go RYR. It's far from perfect, but is a good place to cut your teeth and seems now to be a very good line on a CV when applying to legacies like BA, Virgin, KLM and such.