Are the granada swap just as good as an aftermarket disc swap for mid 60\'s fords
There is nothing wrong with the Granada swap for a normal daily driver type Mustang. As a matter of fact, i know a guy that open tracks with ducted Granada brakes quite successfully.
You really have three players in the vintage Ford brake market Baer, SSBC, and Wilwood. All produce fine brake kits. The Wilwood kits moves the front wheels out aprox 1/2" per side, so if you have some fancy rims take that into consideration. Things to consider are pad and rotor replacement costs and availability.