People who regularly get into fights will have the advantage because they'll be able to handle their emotions better. The only fights I've ever really gotten into on the street have been pretty bad for me. That's mainly because martial arts in general (from my experience) don't teach you the importance of remaining calm in a fight. Usually I'll either be excessively angry or downright shit scared to actually put any training to use in a real street fight scenario.
I think Sven made the best point though. The best way to win a street fight is to avoid it in the first place.
I think Sven made the best point though. The best way to win a street fight is to avoid it in the first place.