For maintenance the Trent 900 compared with the GP 7200 is much easier and faster to handle.Most action on the Trent requires only one cowl to be opened-the GP needs all four and special steps/lifter to work on it.
But the GP is 222kg less heavy and
sounds much better during startup.To my mind the future will show
geared fans in all classes and no more electric driven reverser like A380.