Well, I have both games, so I could try to rack my brains to see if I could recall all the changes made, but I don't think I'd get very far with that. There is a list in the KH Wiki that pretty much goes over everything that was revamped and changed for the PS2 version:
Kingdom Hearts Re:Chain of Memories - Kingdom Hearts Wiki - A world of information not accessible by Gummiship
As for which one I preferred, I still have a fondness for the GBA game. Not that I don't like the PS2 port, but just judging for their respective systems, the original release was a damn good game, and really innovative for what they had to work with in terms of what the GBA could handle. That is worthy of some praise.
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