Bruce Li easily stood head and shoulders above the rest when it came to the Bruceploitation films, and he did go on to make a few decent films that were straight kung fu movies in their own right.
As far as the other clones, Dragon Lee made a few good films, but not exactly his Bruceploitation efforts apart from the hysterical "Clones Of Bruce Lee". I would have to say that "Secret Ninja, Roaring Tiger" was my favourite, helped possibly because it features the brilliant Hwang Jang Lee as the villain.
Bruce Leung made the classic "The Dragon Lives Again". So stupendously bad it is brilliant. The plot revolves around Bruce Lee going to hell and fighting against various famous bad guys that include The Godfather, Dracula, The Exorcist, Emmanuelle (?), a bunch of skeletons, rtc. To assist Lee there is James Bond, Clint Eastwood's "Man With No Name", Zatoichi the blind swordsman and (My fav ) Popeye. As you can imagine you really have to leave your brain somewhere else for this one. 
Personally, my favourite Bruce Lee impersonator is the magnificent Sammo Hung. You need to track down "Enter The Fat Dragon" for a brilliant send up of Bruce Lee's "Way Of The Dragon" that is both funny and also has some cool action. Or "Skinny Tiger, Fatty Dragon" just to see Sammo go into Bruce mode again during the fight scenes.
__________________ “Ah, good taste! What a dreadful thing! Taste is the enemy of creativeness.†My style? .........You could call it the art of fighting without fighting! |