The strongest thing to do is walk away from a fight.
Then talk when you have both calmed down.
However in a confrontational situation, to give yourself an edge never look the other person in the eyes but look instead at a spot on their forshead between their eyes. They still think you are looking at them but you aren't and this can be all it takes.
Remember at school when you used to see who could stare each other out for longest - do this and you will always win that game.
But seriously, it's best not to fight, try to find somwthing to diffuse the situation, even if it's just saying "i'm not going to have this conversation right now".