Re: What is the best kicking martial art?
Roach, why don't you give it a try and find out? At my old gym we had a national savate champion and he was REALLY tough to spar. Kicks coming from every angle. The thing about standing in a boxing/kickboxing/savate stance that's more angled and less square than a wrestling/MT stance is that it leaves your lead leg more exposed for takedowns and leg kicks. It's also not that easy to say "the sport version doesn't have knees or lots of leg kicks, but you can learn them etc" because a lot of the techniques of any sport/martial art are optimized according to making them successful within the rules of the sport.
If what you care about is MMA then train everything at once so that you always keep in mind what doesn't work in that set of rules. It may be that you can do best with boxing or savate instead of MT, but maybe in trying it out you'll see why everyone mostly goes with it.