What style of Fighting would?better for a street fight

kick boxing,bjj

For self defence a combination of BJJ, MT or Boxing and Judo. You dont usually find martial artists street fighting.

i think they try to fight because they want to see who's better.they wanna know if they can beat a trained martial artist.

I advocate the most historical style in the world when it comes to a street fight...

run.

As for vale-tudo, etc, now there's a conversation worth having.

Ju-jitsu or Akido.
Kickboxing,karate take part at arms length and judo is more of a sport
Akido trians for more than one attacker
and all ju-jitsu perpares for mutiple attacks on your feet and on the ground.

tai jutsu

Definetly run...