Sorry, guys, it's not size that matters, but quality.
Some of the big airlines on FlightGlobal's list are pretty poor when it comes to quality of service, by which I mean everything from safety to ground handling to punctuality to culture (as revealed by FC and CC attitude). Ryanair may rank fourth on passengers carried but one flight with them was more than enough.
QF? They were really good once; sadly, only average now.