PS3 for me.
I only have a 20gb HDD in my 360, and I hate the sound it makes when games are not installed, so the multiple discs become a hassle when I want to install them all.
Plus extra content is nice.
EDIT: The 360 version looks better in those screens, but I had heard the PS3 version ran better. It wouldn't surprise me, given how long the game was a PS3 exclusive for.