A well setup awd would be faster than any fwd and rwd car, especially on track!
Not true...that's too big a generalisation.
Why can a RWD Gallardo be faster round a track than a 4wd Gallardo?
Why is a 911 GT3 faster round a track than a 911 Turbo?
Why is a GT3 faster round a track than a R8?
AWD means more weight...and more work for the fronts to do, bar the steering and 50-90% of the braking.
It can be faster...
But it's not a given.
4WD adds traction, not grip.
If the chassis is good enough, and inherently provided enough traction, 4WD is not required.