Jackie Chan's quite a pioneer himself within his field of Kung Fu.

Jeet Kune Do supposedly is the most technical martial art in the world as there is supposed to be a way to counter just about every attack an opponent can throw at you.

I would say Bruce Lee would have the slight advantage in a one-on-one situation.

However, judging from the style of fighting that Jackie Chan is often depicted doing, we can assume that he's pretty good in a one-on-lots situation, especially if there's stuff to throw and move through.