(Most of his movies were made in the East, but it was impressed upon me that things not made in the West, or had no cowboys and Indians in it, were okay. Yes, I'm not all that subtly pointing out an as-of-yet addressed issue I brought up two-plus weeks ago.)
Martial arts has been an interest of mine for a long time. It is arguably the best medium for expressing the potential of what the human body is capable of. The expression is what I'm most interested in, as opposed to its practical application. Which is to say that if I've seen one guy defeat an opponent because of having more skill, I've seen them all; and so I have. There has to be more to it than "I proved I'm better than you" to catch my interest.
That's a large part of the reason for why I like Jackie Chan movies, and don't much enjoy any others in the martial arts genre. See, martial arts movies often focus on the skills of the combatants, with their environment being purely circumstantial in most cases. Even when it's not, there's hardly ever anything to explore, or there's only one or two things that may be used to someone's advantage.
While Jackie Chan does a great job of showing what someone is capable of doing with only their body as the weapon, what I really like is what he does with his environment. I'm even more impressed by it because he puts his body and skills to the test to make it possible. Add in the comedy, which is my favorite genre, and it's a match made in heaven (for me, at least).
I don't really have a favorite movie. This is mostly due to the fact that the plots of said movies aren't all that attractive to me, for one reason or another. I mostly enjoy the fight scenes, and many of his movies have at least one memorable fight scene in them. I also enjoy the outtakes, and I'd watch a movie that had nothing but the outtakes from all of his movies.