That's actually why I went on this thread. I think the bottom line is Metallica is "better" as a premium, but from what I've read the prem also has some toys that break a bit easier (the Bell? I want to say. I've never played the prem. LOVE the pro though)
Better as premium:
Game of Thrones
(both are like different games!!!)
Better as pro:
IMO, Star Wars (the new one).
(I don't like the loop rails that go overtop the flippers)