One hell of a fun game, surprised there isn't a topic on this.
I currently don't own the game, but I leech off my friends, one who has the Wii version and one who has the 360 version :}.
I don't think one is nescarrily better than the other, but I do like the feel of the Wii controller for some reason.
Raining Blood by Slayer owns, by the way. ;D