Value wise, unless you are betting for fun it is really retarded to bet on Conor.
Diaz is an amateur boxer at best and lit Conor up with his boxing. If Conor and Diaz had just had a boxing match for 12 rounds I have no doubt Diaz beats him. And now we are talking about Mayweather. This is going to be so one sided that Mayweather will be able to decide when he is going to KO Conor or get a stoppage between rounds. That is what makes the prop bets on the rounds so hard. Mayweather could toy with him and decide to wait and knock him out in the final round just for the hell of it.
Mayweather by KO/TKO/DQ @ -135 is the bet.