Oggy...track type has nothing to do with grip. Surface type, however does. Tracks like Atlanta are stickier because of the clay they use. Normal dirt surfaces will be less tacky, grass will be slippery, and concrete will be the slickest. It also depends on the tread that the truck runs(doesnt matter in ROR). Large beefy tread will dig into the dirt allowing for more grip, Where balder, turf tires will grip concrete better. That is why off-roaders run super swamper boggers and drag racers run slicks.
Here is a diagram I made...