I researched both. I wanted to go with the turbo, as it was cheaper to get the numbers I hoped for. I'm thankful I could buy one from a friend that had the supercharger already installed, so I could build it the way I wanted to from there and have what I really wanted in the first place! Thanks Brody ( bjk81 )!
Turbos come on all at once. Explosive power, like a 2 stroke dirt racing bike. The power varies with RPM, but once it spools, it's there until you let off. The other negative is that they are more likely to blow an engine. Lean/detonation is an issue on both, but if anything fails on the turbo setup (AF ratio, Manifold pressure, boost control.... as I understood it) you could be looking for a new engine due to a hole in the piston or one of them coming out thru the block.
Supercharging works differently. It is belt driven, so there's zero turbo lag. If you have spooled a turbo, the power is there, but it's powered by the exhaust gases. If you let off, and then put the right foot down..... it has to spool up from the exhaust and then deliver power. Now, on the SC (supercharger), it is ready and willing to put out now, or let off, then back on... zero lag. Whatever HP is available at that RPM, is available the moment you push down the right side peddle.
Mine has enough power in 2nd to spin at anything above 2500-3000 by just shoving my right foot down even with traction control on. That's with a summer/sticky tire. The cooler the temp, the worse it gets. I've had sticky tires give way in upper RPMs at closer to 90 if it's cool out.
But here is the real difference. I run 93 octane only (just for reference), and the SC is very predictable. Lower RPM, it helps, but not intrusive. About 3700-3800, things change. Now the performance is strong and predictable. It ramps up quickly, but comes on with the RPM, so you can feel and adjust for it. Think of a graphic sign that shows the HP as the RPM grows. Think of that as rising quickly after 3800 or so RPMs. That is the SC, and you can let off if you want and then ask for more and it will be right there as before.
This is the best that I can describe it here. If you would still like more, PM me and we'll set up a time for a phone conversation.
Or Dave at DDMWorks can explain it better I'm sure. A call to him might serve you well....