This topic is pointless because street fights are never on an even playing field. There's all sorts of variables such as: drugs/alcohol, weight disparities, weapons, multiple attackers, uncontrolled environments etc...
If you could somehow set up a street fight on an even playing field, then I'd gather the trained fighter is the better bet.
None of this matters because no one ever meets to fight after a "call out". They never do, never will. It's just a manifestation of insecurities and being controlled by the ego.