Halo 2 quick question

[Siretsap]

Ok, all of you who have the game, here are a few questions.

What exactly is different betwen the normal version and the collector's? Cause on the webcite of futureshop it says the collector's has better graphics... which I doubt. I know it has a dvd with bonuses on it.

secundo: If you tried playing 2 players on the same screen, how was it splitted? Vertically or horizontaly?

curious cause someone told me he saw 2 versions of the game, one vertical and one horizontal...


Thanks

Michael