Anything with joint locks and neutralizing and or throwing is good, but it's better still to avoid any physical confrontation. Most first year akido, judo or jujitsu players will know how to do all sorts of painful things with your fingers and wrists. Judo guys going to throw you, jujitsu guys going to throw you, then lock you, taichi guys, you've got a baby cobra or an old man that can't lift a bowling ball, but can kill you with a touch. Question, do you want to risk getting whatever disease the perp has or bleading out? Is the perp on pcp and impervious to physical pain. Are they packing heat? Are you close enough to neutralize said packed heat. Everyone is a tough guy until they aren't. I have met men from different practices, all could kill the average man without trying, without fail, they all have said the same thing, do what ever you can to avoid a fight. Same advice I would give anyone else.