Digital Foundry (Eurogamer) - GT5P vs Forza 3 Tech analysis.

[Cypher1980]

GT5P does look nice and probably edges the graphical battle.

However GT will not be able to match the physics models and sample rates used in Forza 3 given the nature of the Cell chip.

I guess you should go with what is more important to you. Eye Candy or Accurate Simulation.