yeah i've been thinking about this a lot lately and i just cant decide which for my trueno ae86.
Basically:
Supercharger: instant boost with no lag, but loses power in high revs and has probs with high psi level (different pulley) like belt slip.....
Turbocharger: lag, lag, LAG! but good all the way to redline, higher psi possible, more complicated to set up than standard 4agze with super...