Do you mean the fact that all cars drive like awd ones in fh2?
Otherwise rwd tend to kick the rear end out when accelerating around a corner. Where fwd does the opposite, makes the front go out more. And awful generally makes it be somewhere in the middle.
This is very basic example of it though, many factors go into cornering dynamics.
Gives better acceleration (sometimes) and better top speed (usually). Hardest to launch straight, trickiest in the corners.
FWD: spinny bits in front
Most stable at speed, good at entering corners. Slow to launch, but unlikely to spin out. Requires good throttle control on corner exit to avoid going wide, be sure to install a sport differential.
AWD: spinny bits everywhere!
Best launch possible, excellent on corner exit. Very stable offroad. Suffers when entering sharper bends, requiring good braking, downshifts and weight transfer. Weak top speed (usually).