We often see people ask, "Which is better- CSC or Turbo?" The answer would depend on your definition of "better." Here are some differences between them.
CSC's or centrifugal superchargers have a compressor housing very similar to the compressor used on a turbo. The impeller is spun by a drive pulley being turned by a belt much like the alternator, power steering pump, etc... CSCs use internal gears to speed up the impeller by a specific ratio. Because boost is dependant mostly by impeller speed, and impeller speed is dependant on engine speed, CSCs don't make very much power at low RPMs. Power comes in stronger and stronger towards the top end. While this may hurt power "under the curve", it does have it's advantages. First, not many front-wheel drive cars can put down a lot of power off the line. CSC power comes in smoother which makes launching easier. Second, the torque curve of a CSC is fairly flat. Since torque is basically a measurement of how much power the engine can make at one instant, it is what can harm an engine or transmission the easiest. Peak torque is where the engine is most likely to detonate. A CSC doesn't create the huge torque numbers that a turbo does that can easily cause detonation. Also, the trans will hold up better with the power curve from a CSC. Finally, since the exhaust on a CSC powered engine can be built much differently than a turbo engine, the CSC engine can use a more aggressive cam profile in most cases.
Turbochargers have a compressor with an impeller that is turned by a turbine wheel in a separate housing with the exhaust gasses flowing through it. Because the turbo needs a lot of exhaust in order to spin fast, it will never spool instantly even if the engine is revved quickly. However, advancements in turbocharger system technology have made excessive "turbo lag" a thing of the past. A properly built turbo system should spool pretty quickly, and because boost is load dependant, not RPM dependant, turbos can make peak boost over a wide RPM band. This helps turbos to make more average horsepower than CSCs can. Also, turbos do not take horsepower directly away from the engine the way that a CSC does in order to turn the pulley. While CSCs are pretty efficient, they can still eat up 20-30 hp in some cases. Of course this isn't bad when it is adding 200 or more HP.
Here are some comparisons:
Turbos cost less. The actual turbo itself is less expensive than a comparable centrifugal supercharger.
CSC install is easier. I can install a CSC kit in about 3 hours.
Turbo is quieter. It also quiets down the exhaust some.
The new CSC drive systems will be pretty quiet as well.
Turbos are easy to get more power out of a mild setup than a CSC. CSCs require getting yourself into a higher RPM range in order to make a lot of power.
If you have a 3800 stall converter and 3.69 gears, CSC cars will launch hard. CSC cars with these mods are relatively easy to launch and get good sixty foots. Turbo cars are difficult to launch consistently. They have the potential to launch hard, but it's more difficult to do it consistently.
If you run a turbo capable of making 800 HP, good luck spooling it off the line.
If you run a CSC capable of making 800 HP, good luck doing it without belt slippage.
Both can improve your fuel economy. (off throttle of course) Turbo can improve it more since they like taller gears (lower numerically).
Both have the potential to make more power than most people will ever need.
In conclusion, it will always come down to personal preference as well as ultimate goals in order to decide which system is "better."