Yup. Xbox MGP2 is wikid coo'. PS2 gets owned. I have 1 & 2 for PS2 and the PS2 versions are absolute crap in comparison to MotoGP 1 for Xbox. Now that my PS2 has the infamous 'disc read error' and wont read blue backed discs, and the PS2's BMXXX censored fiasco, I always buy the Xbox version if available.
In this case the games are completely different, but the Xbox version is much much better. Do a little research and you'll see why, designable bikes, paint schemes and such.
...in my pants