This is a spin off from another thread, and these are simply my uneducated underachiever's opinions, nothing more.

Firstly we have our standard supercharger.

Pros - no wait for boost (depending on model) decent power, and relativly unevasive install, roughly 6 hours.

Cons - upgradability is limited... sure you can get a smaller pulley, but doing so causes more heat along with the added pressure. Expensive. Very expensive intercooling. Lots of low end torque isn't always the best thing for a fwd car.

Here we have our standard turbocharger.

Pros - Extreemly upgradable. Inexpensive compared to a S/C. Cheap and effective intercooling. Ability to make lots of horsepower. Also, not too complex and longwinded installation.

Cons - LAG. Rebuilds. Can be unpredictable at times, especially an old turbo. More parts to deal with.

Why would I choose a turbo over an intercooled SC?

Because they can make more power.