You call us morons and then name Ponce as your favorite Latino fighter of all time? Each to his own, I suppose. In my case, I would not to give it any thought at all. I'm into quite a lot of Mexican fighters, and Barrera was the fighter responsible for igniting my love for the sport of Boxing. I followed his career from his defeat to Manny Pacquiao, ironically, and I've watched all of his fights, or most of them. People can name more than one, if they don't have a standout favourite. No need to be name calling over it.
Going by the exact criteria of the thread, probably Napoles, Duran, Gavilan, Rodriguez, Arguello, Saldivar, Canto, Monzon, etc.
OK, Adolf. To answer the thread's question, Juan Manuel Marquez is #1. Honorable mention: Ivan Calderon, Miguel Cotto and JuanMa Lopez.