PC also has by far the best racing sim games, so long as your willing to ignore the fancy eye candy of the newer console games, you can't beat the PC with a wheel for realistic driving.
I have a wireless racing wheel for my 360 and GRID is AWESOME on it, as is Forza 2.
What PC racing games are so good that PC has by far better racing games? I am seriously asking this, as I want to try them.