i used to be a GT guy until i played Forza 2 the physics are way better on Forza 2 then they ever were on any GT games, and there is alot more you can customize. and the online stuff you can do like auctions.
I just bought both today and i would say if you want a really good racer forza 2 is amazing in terms of control and graphica and the amount of cars and the things you can do to them, but also Shadowrun is a fantastic multiplayer FPS so if you like FPSs and you have live you need to get Shadowrun at some point, but either you choose you wont go wrong believe me.
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