I'd lean on Garica.
He's more proven, he's bigger, stronger, hit's harder, has much better timing.
There's still things I don't know about Broner. I don't know how he deals with pressure from a top fighter, I don't know if he can take a punch, I don't know how he handles speed, I don't know if he can fight the 12 round distance consistently with top level opposition.
I know all of the answers to those questions about Garcia.