mmm turbo or supercharger...
well as everyone is saying, and this is a bit repetitive...but...it all depends on wat u need it for. Personally id go for the Turbo as they r more flexible...is that the word?? hmm..wat i mean is u can do more with a turbo than u can with a supercharger...even though turbochargers are harsher on the engine's internals than a supercharger.
Id say general dragging at the lights...or for more torque...i.e towing etc...a supercharger would be prefered as u have instantanious power, but for real dragging to racing, u cannot go past a turbo charger, and thers nothing like a lil turbo lag then to get pushed into the back of the seat..ahhh...love the feeling of boosting...rather orgasmic