If I remember reading correctly, the helical doesn't do anything on deceleration, but in road racing allowed faster turn-in because rear wheels never both lock up.

Vs. clutch type where some models allow up to 100% lock up on deceleration (2-way, 1.5way ect?) which is great on say a 911 Porsche with all the weight in the back where you need maximum stability, but turn-in could be compromised because if both rear wheels are locked at one speed it begins to scrub and slow you down. Clutch types also eventually need rebuilding.

Then engagement becomes an issue, I think both clutch type and helical, one can feel engagement which if not smooth isn't always good. Curios to see how the quaife feels in a C43! I'm sure it will be just what the car should have had from the factory!