In my opinion...It comes down to two things...Cost and purpose.
What do you plan on doing with the car and how much do you want to spend?
A whipple upgrade costs around 10K or so on those cars. A twin turbo upgrade costs between 25-35K depending on what you add or spec out on your build.
I personally like the responsiveness and performance of the superchargers, I've gone for a ride in a twin turbo GT and it was amazingly fast after 4,000 RPM...however, below that it was really disappointing.
But, the twin turbo kits look like works of art on those cars! It really just comes down to what do you want, and how do you want to do it and how much are you willing to spend.
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