Robert Gentel wrote:
Brazilian Jiu-Jitsu and Krav Maga are a lot more effective than anything else on your lists.
Krav Maga wins IMO. BJJ is amazing in 1-on-1, but it's bad if you have multiple aggressors. KM maybe less effective 1-on-1, but still excellent, certainly superior in survival situation with more than one person attacking you.
But the above is defining potent and effective in terms of fighting. As a martial artist, I personally believe that potency must be defined more in terms of safety and situational awareness. It's also not about the technique either. I believe it comes down to the individual's discipline. For that, I think a disciplined martial artist of any style is the best.
I love the athletes of the UFC and everything, but I worry that a new culture is developing around MMA that promotes fighting over all else. I remember when I was learning simple Taekwondo how worried I felt that I could hurt someone, and frankly how easy it was. I developed a better respect for using my mind instead of might because I did not like to hurt others.
Today, I appreciate martial arts more for the sport and athleticism.