I mostly fly WTP, on a mix of BA and AA
On BA, the 787s are fantastic in WTP, and in A380 & refurbed 777-300s they are pretty good.
But I've had a few 747s and 777-200s recently that were atrocious, topped off with a 747 from LAS-LHR last week which had broken heating - 10.5hrs with two blankets, shirt & jacket zipped to the neck & constant icebox-cold air onto my head wasn't a great experience.
I'm increasingly leaning towards AA for PE flights, unless I can be *certain* I'll get a decent plane, or that it's so dirt-cheap I can write it off as a way to get some extra TPs