They all do the same thing . . .but there are other considerations. For example, in Arizona, where I live, Kenne Bells are hard to run because of the heat issue. Similarly, depending on what car you have . . . and whether you want to do an aftermarket hood . . . your choices may be further limited.
I went Vortech because I can add an air to water cooler later. I also like the centrifiguls in general, because you can use water/methanol to cool them . . . which I currently do.
The bottom line is that they all provide forced induction. Considerations like climate, fit, price, and adaptability are the considerations that make one better than another for any particular application.
Just another 9 second alcohol powered 95 GT Vert