They were all actors, so what you see is not the real deal.

I have a friend that is a 5th degree black belt who auditioned for a movie and sparred the Chuck Norris and he said it was intimidating and Norris was the National Karate champion for a while.

That said, I would have to say, between the two, Bruce Lee though for his speed.

In the movie the Big Boss if he would not have destroyed the real fight scene that happened on set, we would have seen the real Bruce Lee fight.

I would imagine there are several current MMA fighters that if matched in their day could give either a serious tune up.