Low 5-B VS 5-B, so Bro has the obvious AP advantage. This means that Proto will struggle a lot to take Bro down due to his AP and Dura advantage.
However, Proto is also far more versatile considering his range. Proto is probably far more street smart in comparison since he has much more fighting experience apparently. His Shield should be able to tank Bro, all things considered.
I give this to Proto 7/10 simply due to his general superiority in everything other than AP. He would only lose if he was dumb and let Bro get near him or similar. Also, he would also remove Bro's shades far more easily due to range.