KH Discs vs 73+ Discs

Did anyone else mention that the Vette was also 4 wheel disc not disc/drum! So it had 4 Kelsey Hayes with bigger rotors and bigger tires vs the Dart disc/drum. I like the IDEA of more pistons on the caliper but I'm not sure in comparing these two systems the Kelsey Hayes were any better. The problem I had with the sliders is the pad availability for Autocross, no Hawks ar anything race-ish available, are there for the K/H?