You really can't compare a centrifugal to a positive displacement blower, they are different animals. Any of those you listed are going to get great results. Most HP and torque completely depends on what the rest of your setup is like.
Honestly this sort of question is kind of like asking "who makes the best pizza?". You'll get a ton of opionions and there is no real wrong answer... excpet papa john's. That is not real pizza but I digress.
If you have a 97 Cobra, which I am assuming from your username, you can't run an intercooler with a Kenne Bell or a Whipple without swapping to a C head (99-up) setup. Yes this entails a full head/intake swap but you always want to keep the 96-98 Cobra cams. If you are going to stick with the heads you have, get a Vortech.
In any event, the rods in a 97 Cobra are your limiting factor and you won't want to push it much past 400-425 to the wheels. After that, the rods get angry and start trying to escape. And any supercharger kit is going to easily get you to the 400-425hp limit of the stock motor.
2000 Mustang GT Steeda #0048
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.