In a modern car the differnce is minimal, and in something like a small car the extra power loss through a RWD driveline can make FWD a lot better, but generaly a FWD gives the Front wheels extra work cornering under extreme conditions (racing).
In a RWD car the front wheels can work on steering the car, while the back wheels work on acclerating it.
There is some advantage to be had regarding weight transfer under accleration, but only on cars with very very high hp numbers.