Turbo vs Supercharger

[NickCats]

I wanted to get some feedback from some of the great technical minds on this forum regarding the pros and cons of adding twin turbos ( exhaust driven ) or a supercharger ( belt driven ) to a Boxster

From what I can tell, adding twin turbos will give you approx. 60 hp for around $7k :

http://www.turbowerx.com/page1/page3/page3.html

TriGem2k, why are you considering this over a supercharger ?

Alternatively, a supercharger will give you approx. 80 hp for around $6k :

http://www.imagineauto.com/boxster%20sc.htm

ohioboxster, what made you go with the supercharger over twin turbos ?

Overall, I guess what I am wondering is this :

What makes one better than the other ?

Which would put more wear and tear on the engine ?

What are the advantages / disadvantages between the two in terms of performance ?

Thanks in advance for your input

Nick