Both have good speed, power and movement. Gamboa has a questionable chin, don't think it's as bad as everybody says but if Broner tags him, he could be in real trouble.
At the moment I'd pick Gamboa to win this, based on the superior opposition he has faced. I think he'd have enough about him to grind out a result.
I would bet on Broner. Gamboa is a hard puncher and an electrifying performer, but his defense is very suspect. He has been rocked several times. He has come back to beat the threats, but Broner is in a different league to the other fighters Gamboa has faced. You cannot afford to get reckless against Broner and that is just how Gamboa fights. I think that it would be an entertaining fight for as long as it went.
Down goes Gamboa
Gamboa went down in his last fight against a nobody+he's smaller=Broner.
Muhammad Ali.
Is this even an appealing fight?