Don't get the GameCube version if you don't have to. My reckoning of its failings...
- One character voice option instead of five or six
- Eight missing music tracks (20 instead of 28)
- Framerate skips occasionally (nothing to moan about, but it's there)
- Wretched tattoo texture detail
And that's just the stuff I noticed, not the results of any painstaking comparison. Xbox is the best 'cuz of the load/save times, PS2 is just behind.
To whoever asked about vocals in the songs, yes, they have 'em, but the tunes in gameplay generally have the vocals mixed down pretty low, or parts of 'em edited out. I actually like it that way, the music is less repetitive/distracting.
DFS.