Hmmmm.
Everyone assumes that kicking does more damage, and is therefore more useful in a fight. However, it is of my opinion that kicking is almost completely useless in a street fight, unless one has had prior experience and/or training. Firstly, unless you have incredible lower body strength, your assailant is not going to be incapacitated from a kick to the gut. Secondly, I believe that it takes a longer time to land a kick than a punch. Thirdly, all the vital areas are on the upper body, so unless you have incredible flexibility, or, like I mentioned before, training, you're not going to land a kick on the face.
I think it's quite clear where I stand.