I would imagine that any of the supercharger manufacturers are going to try to persuade you to buy their product. I also think each of them makes a quality product as long as you understand the limitations of their systems as well as your own engine's capabilites and limitations.
From what I understand the Whipple and the Procharger systems are both the easiest to install and the easiest to maintain.
There are many threads on this subject that can be accessed by doing a search.
Good luck on your quest for performance.