XBOX v. PS2 (Specifically Harry Potter + Pirates)

Everyone's still on about XbOX360 v PS3 I'm sure. My question relates back to the days of XBOX v PS2, however.

My girlfriend isn't a big gamer, but she loves Pirates of the Caribbean and Harry Potter, so I was going to buy some games that she'd enjoy too. Most of the games from these series are on original XBOX or PS2. (360 supports all of them and I have a PS2)

SO! I was wondering if anyone had any advice console-to-console, hopefully focused on any of these games. General advice would be nice. I've heard fanboy rumours, I'd just like some help deciding which platform I should buy these games on.

Cheers!

My advice probably won't help you, but my sister bought the DS version and gave up because she said it was way too hard.

EDIT: Whoops, that is, the DS version of Pirates: At World's End.

Interesting. I was definitely planning to start at the oldest and work my way towards the newer.

Not just because of story lines, mind you, but also because the original XBOX games are floating around the $10 bargain bin at GameStop.

Thanks for your advice though.:)