Its got to be Taekwondo. You see those high-flying kicks in the street all the time, especially where I live, which is Taekwondoville. All you have to do is count, ahna, dool, set, net and there ya go, four high kicking streefighters are at it already.
I jest. Its Muay Thai.
Though this guy would disagree:
The answer really then is, its not the art, its the man and how he uses the art.