Old Vaquero, unless you have a hard time keeping stuff repaired.
Old Vaquero. You really shouldn't have a hard time repairing things anyways (well, I don't anyways, I make too much money from gambling and the DLCs.)
For melee characters, Old Vaquero, Fullstop. Regular Maintenance is already as good as it is, even if you plan to use Hand Loader / Max Charge ammo. For guns character, unless you plan to have very low repair skill (which I strongly don't recommend) and not planning to pick Jury Rigging, then you should pick Old Vaquero, it has slightly better ending for Raul as well. Pretty awesome watching Raul gun down 2 fiends with Lucky in less than a second.