Turbos are driven by exhaust pressure so the output is flat at low end, begins to climb at mid range and climbs steeply at top end, great for racing.
Super chargers are driven by the engine so they give a linear boost, That is why they were used on work engines like the Detroit diesels.
If you want to help an engine breath use a super charger. If you want a spike in top end horse power use a turbo.
