Its' been my experience...
Never flew the RR RB211, so I can't speak from experience. However, the engine has an excellent reputation.
But, I have a lot of experience with the CFM 56, and I can tell you, of the few problems I've had with that engine, ALL were due to poor maintenance. (Nope, can't blame even one of them on pilots, either!)
Fly Safe,
PantLoad