Geez its the same arguement everytime GT and Forza get compared to each other.
Xbox Fanboys say - "Its cause PS fanboys havent played Forza"
PS Fanboys say - "Its cause Xbox fanboys blinded by fanboyism or havent played GT"
At the end of the day neither matter. It depends on what YOU like to play. I myself prefer the GT series. I've played Forza on the Xbox and thought it was great. MS answer to a GT on their console. Both consoles have a great racing sim for their own.