There has been a lot of talk the past few months on what supercharger you should go with. If you still aren't sure... check out the video below.
This is a great video to show you EXACTLY what you will get with either a positive displacement (PD) blower or a Centrifugal (hair drier/snail) blower.
Like said by many, both great ways to make power, just making power differently.
Wish they had video of them running them on the dyno.