Question: what do you want the boost for?
Personal opinion: We have superchargers on our personal vehicles for two big reasons, they are HEAVY and DDs. I wanted the quick off the line get up and go, ease for merging in traffic, reliable, and good MPGs. I didn't need something for the track (rarely do I go above 85MPH), so I wanted my power down low.
I LOVED the Radix 112 on my 5.3L Tahoe, that thing was a beast. Coupled with the right cam, she would scoot.
The TBSS (TVS1900) and SSS (TVS2300) are downright nasty with boost, granted they have larger engines (hence the larger blowers).
Were we to put something on the WS6, it probably would have been a turbo.
Professional opinion: Both superchargers and turbos are fantastic (provided you are buying a quality product), and we have many a customer from both camps. Again, it boils down to that initial question- use.
We currently sell Magnachargers and Vortechs (with other products coming onboard here in the future), and we certainly would not carry something that we would not put on our personal vehicles.
EDIT: There are two primary types of blowers:
Positive displacement: maggie, whipple, vortech, which makes boost immediately
Centrifugal: Like a Procharger, which builds boost as RPM increases