Superchargers are from the start, run out of puff top end, turbo's usually kick in around 2.5/3K on petrol cars.
They are kinda irritating if you put your foot down then suddently they come alive but saying that, once you get the hang of keeping it in the power band, I reckon turbo's are better.
They are more economic on the motorway off boost. But they DRINK fuel.
VR6's are midrange power aren't they?
I'd supercharge it myself but I'd ALWAYS be wondering what the turbo would have been like.