Whats better, Ridge Racer 7 or Grid? -

Im looking for a good racing game for the ps3. From what I ve heard these are some good contenders. Which is better and any other suggestions?

Chicago section

I myself have a Xbox 360, but I love GRID. I have played many racing games and it is the best. I feel sure that just because they are different consoles does not mean that the game would be much different.