When I change from the Burco centrifugal oil bath clutch, (state-of-the-art at the time) to the Horstman disk clutch, I found that the Horstman seem to have more top end. I don't remember it being any better on the bottom end. Just a feeling really, no hard facts to give you. I do remember that nobody, at this particular race, past me on the top end. And I do remember a lot of people scrambling to refine their setup.
In my opinion, (and my opinion only) if a clutch is slipping at peak torque, and isn't producing excessive heat, the amount of torque being transferred to the rear axle is pretty close to the same, no matter the clutch type. Only a theory of course, but a theory based on a lot of hard work and testing, not bench racing. lol