ANY ART - you'll do exceptionally well 1v1 and even if you gete mobbed and in closed quarters you'll still do well.
SO LONG AS you apply yourself and put in the effort, if a bloke that practices 'Drunken Panda Yellow Leaf Deathwing of the south northern system of the weng fui system...' but if he practices the art with all his heart and knowledge his effort with everything he has!
he could beat a 10th degree black belt in '1 touch death' if the 10th dan black belt didn't train as hard or with as much effort as the other practitioner.
in the end like I said above it all comes down to what YOU YOURSELF put in!
EDIT:
That being said.....there are some arts that are just PURE BULLSHIT! do a little reading about "Yellow Bamboo" haha.... its a good read should make you laugh a bit
there was a (self proclaimed) MASTER OF THE DEADLY ART YELLOW BAMBOO! and this "MASTER" put up a tournament for other martial artists to enter, his first figth was against an asian man I think he was a shootfighter (shootfighting is similar to wrestling) anyway....
Fight starts Shootfighter sends in a punch lands it on the MASTER OF YELLOW BAMBOO, the 'master' wobbles a bit then regains his composure only for the shootfighter to yet again throw in another punch but this time it was too much for the master and he submitted verbally due to 2 strikes in less then 20secs.....
here's the best part (remmber that was the 1st fight) the MASTER OF YELLOW BAMBOO was one of those "my art is the best and Im going to show you why" kinda guys, he STUPIDLY made an award of $5000 to the victor of the tournament. He assumed that he would just pocket his money back...20secs later he is out $5k.
HA