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Supercharger is belt driven so it takes up some of the power from engine to operate. Turbo is exhaust driven so it doesn't takes up power. So when turbo kicks in (let say usually around 3000 rpm), it can pull a lot harder than supercharged. Unless you don't use you mid/ top range at all. Some cars nowaday use two smaller turbos ( one on each exhaust manifold on a V-shape engine) instead of one big one, and boost can start earlier and smoother.
And also.....no one make supercharger for SR20DE yet, as I know...
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