STS turbo vs. roush supercharger

[Power Hungry]

Turbos tend to be more efficient in terms of output vs parasitic loss. Outside of that...

Turbocharger advantages:
Less expensive
Easier to maintain
Boost level controllable by wastegate

Supercharger advantages:
Linear power output
Easy to install

If I were to choose, I'd go turbo even though the systems are a little more complex. However, since you're running full duals it might be cost prohibitive to try to run a twin turbo setup. That's up to you, though.

Good luck with your decision.