Brake kits: 4 piston or One ??

Rainy Day Auto said
the more I am reading ….this one seems like an all around good kit
Right Stuff MDC66SD: Front Disc Brake Conversion 1960-76 Mopar A-Body (Barracuda/Dart/Duster/Valiant) | JEGS

Same kit the ram man sells looks like to me. The Ram man was a bit lower priced, you can by the rotors at any auto parts store so I saved a bunch buying my own and saving on shipping. Did you look at my restoration thread Rainy ?