One thing about the screw style superchargers is they develop a lot of boost right from the bottom and have both internal compression and almost no leakage past the rotors. They are almost a perfect storm. Lots of bottom end boost and they hang on at the top really well with great Adibatic Efficency, Meaning they turn less work into heat per pound of boost than a roots and almost but not quite the same as a Centrifugal. I did a lot of work on Keene Bell blown Ford motors some years back and Screw Blowers are the real deal. I do think that a turbo or a Ripp will beat it for pure power but for a nice fat torque curve it might be the fattest.