Two 10 rounds and one 12 rounds fights. Both could be inconsistent,but we're definitely a brave glove trotter, underachiever skilled guys that's mostly on the short stick of a hometown advantage. While Emanuel's style is mostly praised and more popular for it's mix of brilliance,talent and skills,but these unorthodox rhythms drew back at times as it left his face open for stoppages,despite having a strong chin,he managed to hold a minor belt and fought a good amount of notable future/current/ex world champs during his career.(John John Molina,Floyd Mayweather Jr,David Diaz etc.) Mamby is a more methodical,but very versatile technical fighter that could beat anyone in a good day,capable of good amounts of adjusting his plans when fighting his opponents,he also had a tank chin,only stopped once and was fighting until 60,he fought less notable champs than Augustus,but performed very good while it lasted.(Buddy McGirt, Esteban De Jesus,Billy Costello etc)
Thats a tough one, a battle between 2 atg journeyman. Gun to my head I'm going with Mamby. He just did better against better level fighters than Augustus did.