The GE engined B767s are the hotter of the two types, as Keg says more grunt, burn less fuel and are a lighter engine than the RR donk.
Out of CHC a couple of nights ago doing night freight to SYD, can't seem to get away from it, AUW around 119t and using full bore, because of concerns re possible windshear,
and the thing leapt off the runway. Rotated to around 25deg ANU and pinned the VSI on the stops (6000fpm) until about F250. Reached TOPC, F380 12 minutes after liftoff. The F/O, an ex RAF Tornado driver, said the performance was similar. Not bad for an airliner!
Regards,
BH.