TUI is one of the best employers in the UK, definitely not perfect. Leading rostering agreements, potential to earn a lot of money with overtime. My advice would be to leave Ryanair, once you have those golden handcuffs (command) you'll find it harder to leave. The grass really is greener away from FR. J2 seems to be doing well, but plenty of people join TUI from J2, not all that common for it to happen the other way around so I think that says something. For what it's worth, I don't work for TUI either.