Actually with regards to superchargers, there's two types, Positive Displacement and Centrifugal.
Positive Displacement (similar to TwinScrew) superchargers give you instant full boost (or at least a really quick build up to full boost) once you step on the throttle.
With the centrifugal supercharger, the boost builds up linearly.
Personally I like the power delivery of the Twin Screw over Centrifugal, but off the top of my head they don't have a kit out there yet for the E46 M3's utilizing the Twin Screw blower.
-=Slow In Fast Out=-