Turbo Charger as you stated builds up boost and gives you near 100% when it engages, downside is that too big of a snail will give you greater outputs but cause greater turbo lag. Small snail is more efficient but yields less power.
Supercharger is more gradual in terms of output. It's linear meaning as RPM increases so does the power output. Peak output is usually around 4500 to 5500 RPM. Most cars these days with factory FI in the domestics do S/C (Zr1, CTS-V, GT500, Cobalt SS, etc) Imports typically do Turbo (WRX, EVO, Etc). My guess is that most imports have a crazy Redline so they can add larger turbos to give more power. The higher redline allows a decent powerband still.
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