um, besides the different characters the game is pretty much identical... besides of course the usual slightly crisper XBox graphics and the PS2 and GC basically side by side.... I'd go with the PS2 version anyway because of the better controller, even though I would loooove to play as Spawn, the XBox wouldnt be my choice...
oh and to answer the question asked about why they picked Heihachi and not Dante or whatever, its cuz this is a Namco game so its a lot easier to just stay in your own camp then to go outside
[]D