Turbo over a Super for me any day. Superchargers' boost curves are linear to engine RPM's - turbo's have a geometric progression, a "snowball effect" if you will. Also, the torque onset of turbos is just a tone of fun to drive, and helps with high-power traction issues.
Case in point, I'm going to build a Shelby Cobra replica and going to have to do a turbocharged something (I'm actually leaning towards a Surpa motor/tranny BTW, but the '03 Cobra drivetrain does present another good option). Besides the fact that turbos are fun, one big reason to use one in this application is that the Cobra replicas (which weigh between 2200 and 2500 lb.) that make 600hp, 700hp, and 800hp all do about the same time in the quarter, because they can't hook up. I'm talking spinning thru 4 gears and still running 9s . These usually use BIG V8's which make a lot of torque down low. Not good for traction. By using a turbo motor that started spooling around 3kRPM and made full boost by the high 3's, I'd be able to get a nice rolling start and then have the real power come on. Also, using a turbo motor will allow me to run as much power as the big blocks with only 2/3 the weight. You have to admit, it'd be damn cool to see a 2.2 60' time on an 8 sec. quarter run Yay for turbos
'03 Cobras rule BTW