both have their positives and negatives and depends on what kind of racing you are talking about.

Usually RWD is far superior in Drag Racing
I think in real road racing it doesnt really matter although you dont see many FWD cars at petit lol I think most are RWD or AWD.

I think its generally accepted that FWD in any type of track racing isnt the most desirable. You should use them to steer, not steer and propel the car down the track.