Which style should I train in?

I am starting to go to a gym that offers cles in kickboxing/boxing, jui-jitsu, and a combined MMA cl. I don't know which one to chose to stick with, or if I should rotate between them. I am 5'11- 6' and ~180 lbs (I haven't checked in a while). They offer a free cl for each one and I am going to try all of them, but I want some info on what suits my body as well as personality.