Since turbochargers and superchargers cost about the same (around US$3000-4000 for a good kit), other merits and problems must be considered when choosing whether a supercharger or turbo is better for your car. The following are some of the most common pros and cons that turbochargers have:
Pros:
Turbochargers utilize exhaust heat which would otherwise be wasted. This reduces parasitic loss compared to superchargers, which directly derive their power from the engine crank.
Once the turbo lag subsides, turbochargers generally have a flat torque curve until the turbine RPM's get too high
Turbochargers are lighter and more compact than most superchargers
Higher boost levels are possible with turbochargers
Cons:
Turbo lag (the period in which the turbo cannot make boost because the exhaust pressure is too low, as is the case in the moment after starting)
Creates an exhaust restriction
Effectiveness of turbo is highly dependent on cam profile
Are viewed as "import" modifications in some domestic circles (which is part of the reason why muscle cars use superchargers much more than turbos)
Extra plumbing and modifications to the car are needed because engine oil is shared, and the exhaust is used
Engine must idle a minute or so before and after using the turbo to prevent "coking" and excessive turbine wear
Are harder to install
Almost all turbochargers require intercoolers, because they run hotter than superchargers