My opinion is solely based on my knowledge of these (which is limited in the case of many of them):


Krav Maga
Jeet Kune Do
MMA
Muay Thai
Boxing
Kung Fu
Aikido
Karate
Tae Kwon Do
Judo
Tai Chi


I don't know what these are - Stav, RBSD


Wasn't aware that this was anything other than running, jumping, and climbing - Parkour



I believe that this is kinda aribitrary though. I think that the teacher and student mean a hell of a lot more than what art it is they practice. If the sensei doesn't know crap, and the student buys into what he is being taught, then he will get a false sense of security. If the sensei knows exactly what he's talking about, but the student is not a good student, then it wson't matter. It takes a combination of a good teacher, a good student, and a good curriculum to make a good fighter regardless of style.