PAL has the Dark Aeons and Penance (the optional Superbosses of the game) a more complex Spheregrid, and some differences in some of the Aeon's Overdrives. It's up to you whether you think this is better or not. And i'm pretty sure you need a PAL Ps2 to play the PAL version, which might be tricky to get your hands on if you're in NA.