I see these questions posed all the time. Which is the best?
Its all about personal preference. Any kind of forced induction (given they are set up to give the same performance values) will do just as good as any other depending on car setup.
Its all about what you want your car to do. There was recently a MM&FF article with a
Whipple and a Procharger with identical car setups and almost identical power numbers. In the end the performance was almost identical. The power just comes in on a differen't spot in the curve.
So. That being said. Differen't types of forced iduction bring in power in differen't ways. First you have to figure out what you want of your car. Then and only then can you figure out what type of F.I. to buy.
If you have a daily driver that you want to be fun and aren't seeking balls out power. You will most likely be happiest with a twin screw or other posative displacment blower. Power right at the tip of the throttle, but not nearly as peaky or effiecient on the top end.
If you want balls to the wall power. You want a turbo. No perasitic drag. All the power you could ever want/need/have. So whats the drawback? You don't get power the second you stab the throttle. The power builds on itself gradually (how gradually depends on the setup) and what you end up with is peak power. With a HUGE amount of mid-range torque.
If you want a comprimise. A centri blower is right up your ally. Power builds like a turbo only slightly faster with slightly less mid-range torque. Not us much "Under the curve" like a Twin screw or a properly set up turbo.
The best way to figure it out is to get behind the wheel of a few cars with FI to see what you like.
Best of luck. (This all comes from about 3 years of solid research done by myself and reading things others have said. I've driven a S197 with just about every setup other than a turbo) . In the end, if all you want is 450rwhp and to keep your car a daily driver. A saleen blower is probably going to be your best bet. But if you want your car to move the rollers at anything over about 600 to the tire. Then your looking at Whipple, KB twin screw. A procharger, Novi 2200 Centri or finally and probably the best system to grow from street car to track monster. Turbo.
/Rant
Let me know if any of this make sence and I'm sure someone else will chime in as well.
P.S. - Don't forget N2O. Torque in a bottle. Awesome power dollar for dollar. Also remember there is always a exceptions to the rules.