I flew WTP on a mid j 747 yesterday, 15A is a great seat in the cabin (window seat with aisle access), and the cabin is great (separate from wt)

On the 767 it's good as its 2-2-2

On the hi j 747 you get 28BJ and 29AK as good seats

On the 773 you have a good IFE and the exit rows have plenty of room to get aisle access from the window

I havent done the 787 or A380

The 4 class 772 is acceptable, but the worst WTP cabin is the 3 class 772 in my experience.

Hard to rank as it depends what you're after and which seats are available

All wtp cabins beat the horrendous A321 mid hauls