We have enjoyed all of them we've seen (we haven't seen the Fantasy's or the ones they do on longer Magic cruises), but if I had to rank them in order of my overall enjoyment:
Twice Charmed (Magic)
Toy Story (Wonder)
Villains Tonight (Magic)
Disney Dreams (Wonder)
Villains Tonight (Dream)
Believe (Dream)
Disney Dreams (Magic)
Golden Mickeys (Wonder)
Golden Mickeys (Dream)
All Aboard (Wonder)
A lot of this depends on the specific performers, and of course they change and move around. Obviously Villains Tonight and Disney Dreams are the same show on both ships they're offered on, but I thought Hades in Villains Tonight was a bit better on the Magic than on the Dream when we saw it, and the lead for Disney Dreams was a little better on the Wonder than the Magic. I thought the script for Golden Mickeys was kinda dumb, but the performances were excellent. And All Aboard is not much of a show, partially because they need to leave room to show samples of the other performers and extra foofaraw from the cruise director.