In this video, you have one of GSP's trainers discussing what he feels to be the best MA for streetfighting.
He lists the usual's, such as Boxing, MT, and Wrestling.
But he overly praises BJJ.
He disregards 1 v 2-4, and mainly sticks to discussing 1v1 fights and does not mention situational awareness.
I feel that Hybrid schools are the best choice where each day is a specific art.