There is very little difference to choose between all 3 engine types when it comes to out and out reliability ie engine failures.
The RB211 is the heaviest of the 3 but when you take the weight of the powerplant, the Royce includes the complete pod, thrust reverser and the rest of the associated junk
The other two types the thrust reverser is Boeing, part of the airframe and stays attached to the same during an engine change for example.
The Royce has a better S.F.C over the life of the engine with a lower deterioration in efficiency.
FWIW it is a delight to work on very straight forward and no unneccessary complications.
The Royce is a three shaft layout the other two have two shafts.
One minor point the other two rotate the wrong way
