Sound like you need to do a little more research on the pro's and con's of each. You could try doing a search in the FORCE INDUCTION forum for this info.
After you do that if you still have questions, you should rephrase your question to include some more info that would help us help you ---> like what you plan on doing with the car (ie. drag, autocross, road racing, for fun, etc.), what kinda of power are you try to put to the ground, amount of money you want to spend, how anal are you about maintence on your car???