there not best stance for fighting and there not best style for fighting, look BJJ guy they can expert on ground fighting and other, no matter your size cause in street fighting there not rules there, you can do anything, use your power and speed to do intercepting, do ahead, look bruce lee he is small but he is great.
Hands in front of your face, legs shoulder width apart, angle yourself and on your toes. (sorry for the bad description)
this has nothing to do with martial arts.
Best stance for street fighting ?
I'm short 5'2 most people where I live are 5'6 and im a little husky , I'm fast and I can connect wih strong hits. I like using street fighting / a little bit of mma