For me, on our track, I can get the almost the same feel from the c hub or a hub. This is the fun of low to medium bite.

The thing with the c hub is it allows for a much lower roll center setting, so if you find yourself running the stiffer springs like white or grey in the rear of your car, then you can use the c hubs to get some of your chassis roll back for infield traction. For our track, greens in the rear work best, so we actually have a lot of chassis roll readily available and C hubs need to be run with zero washers shaved to even work right. Then you're left with nowhere to go if you want a higher roll center, so we tend to stick with As on almost everything here. Those who go out of town will tell you that Cs work very well on other tracks, so it is seriously just a tuning option, no one option works better everywhere.