Its an interesting question. Turbos are by nature more effecient since they run off power that would otherwise be lost vs superchargers which are driven directly off engine power.
From a practical view view though the limiting factor on how much power you make from a 4.6 isn't really an efficiency issue. The limiting factor is the stregnth of the engine internals and drive train.
With say a $7,000 budget I would go with a supercharger. With the saved costs of easier tuning, installation, and parts that leaves quite a bit left over for replacing engine and drive train parts. The turbo will eat up most of the budget leaving the limiting factor as the internals and drive train.
With an unlimited or much greater budget I would go with the turbo. In the long run if breaking stuff isn't a concern the turbo will be more efficient and more powerful the supercharger, not to mention much cooler.
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