I'd see the movie first. The plot makes less sense in the movie than in the show, but you might as well know what you're getting into. It's so funny, it's like a bad acid trip.
Apparently it's a bit darker. Kind of like what happened with Wicked, for the movie, and hence the musical, the more obvious political undertones were removed.
Remember what Raúl said in that interview about the Nazis, etc? That was about the novel.
WHY do they make musicals less dark? it annoys me. that's why i think wicked would have been so much better as a play. the music and singing makes it too 'happy'.
I think that if Wicked were to live up to the book's potential, it would need to be written by someone like Sonheim who can handle politics and complex emotions. Bek, most tourists don't want dark and at what it costs to run these things, they need tourist dollars.