The GE CF6 is a twin spool engine.
The RR RB211-524H/G/T is a 3 spool engine. Its also heavier than the GE, it is also more robust and can take a little bit more of a hammering than the GE. You will also note that there are a lot of PW aircraft parked up in the states with the GE's still flying.
BA wanted QF to take more 767's and the ZX 767's are primarily used on the milk run as they get a better economy out of the aircraft than if they were to use the aircraft east west, which happens about 1 flight daily.
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