Best for street fighting ?

Kind of depends what kind of fight. If it's one on one then anyone will probably work as long as you are in shape and have good fight experience. If it's like a brawl with a whole bunch of people then I recommend something that develops your lateral movement and being able to defend yourself against guys coming at you from all types of angles. You can't turn your back in a brawl and you need to stay on your feet or you will get hit in back of the head or stomped, so like a boxing or Thai boxing, or Wing Chun is really good for street fights.