Nothing is wrong with P&W engines...it is about commonality with the rest of the fleet.
I just think that any airplanes the we actually buy are likely to be GE-powered, not P&W.
Opinion only...having operated GE-powered 747 Classics, and 747-400s, since 1999, I think it is a better fit for us. And yes, I do also have time in P&W-powered DC8s, and 747 Classics.