Forget about rumors, you want.......DIRT. Here's 10 reasons why:
1) Dirt rules. 2) Dirt kicks a$$ 3) Carpet does not rule & can not kick a$$. 4) Big air = need dirt. 6) Sweet rythym section = need dirt. 7) Monster-wheelie popping-hella traction coming off a corner. 8) All off-road racing vehicles rule & kick a$$. 9) Roost. 10) You can not mix clay with carpet.
These are just a few reasons that I can think of quickly. Let me know if you need more convincing about the benefits of racing on Dirt.