What martial art do you think is best for a bouncer ?

I was a bouncer/cooler/doorman for many years. My martial art at the time was pure JKA shotokan. It was perfect for the job. This in no contradiction either. The stand-up grappling of shotokan was excellent at removing the risk without endangering myself or others. Many mistakenly believe karate is only a striking art. This is not the case. I even got a funny nickname because of my shotokan grappling. They called me "Tentacles", because I have long arms and could "wrap-up" guys trying to punch me like a tidy package, and gently remove them. During a 5-year stint in one bar I hit 2 persons, and one of them I hit hard. Because there was no need to strike. The art you use is not as important as how you use it, and what parts of it you use. Shotokan has many techniques that break people bad. Yet I only ever "broke" one guy who left me no choice. (had I been better at my art I may have had more choices) The main thing you will need is a cool and clear mind when confronted by drunks. It all comes down to intent, and the bouncer's intent is to keep the peace, and not to be seen fighting. Mostly you are a babysitter, but sometimes a 250 pound baby had a tantrum, and you should be able to handle that reasonably without doing him harm. Pick an art you like, and learn the aspects of it that will help you at work. Other than that, use your head, stay calm, and take out the trash. Gently as possible, of course.