Jackie Chan is a very good comedy/martial arts star. He does one kind of martial arts that Jet Li doesn't know how to do and Jet Li does a martial art that Jackie Chan doesn't know how to do. You can both go to two Chinese restaurants, but both can have different kinds of food.

This quote means that Jackie Chan and Jet Li have different talents when it comes to martial arts. Jackie Chan is a skilled comedy and martial arts star and Jet Li is a skilled martial artist who knows different styles that Jackie Chan does not. Just like someone ordering food from two Chinese restaurants, each person will order something different depending on their tastes.