comparing apples to oranges really, it's just gonna depend on the person.
the few turbo kits out there have a lot of potential to make more power then a supercharger set up ever will. there are only 2 cars that i know of other then Clamphier who have had the lpf kit thats alefire who gernaded his motor thanks to Henson and This guy named Chris Gibson with a bad *** white 3.7..
There is also 2 more cars running the Bomber single turbo kit, which is a pretty damn nice setup too and those guys are making close to 500rwhp
you also have Chris (landtosea) who just finished his custom turbo setup making 400+ and he's still working all the bugs out.
i can tell you the driveability with the procharger is outstanding and if you couldnt hear it whining under the hood you would never know it's there.. the maintenance on the procharger isnt bad at all, oil change every 6k belt change every 15k... the only drawback i've had is belt slip when the blower gets hot. mpg's are good when you keep your foot out of it, i think i'm getting close to 23-24 mpg's with my 4:10 gears.
there seem to be a **** load of FI 3.7's running around now, more then a dozen procharged guys and half a dozen turbo guys and a few nitrous
the known failures of guys with turbo kits
have all suffered hurt motors from running some type of turbo setup.. not saying that was the issue.. a lot has to do with tuning..
know failures of procharged guys
are the only guys i know of on forums who suffered hurt motors with the procharger setup...
NOT THAT THE FAILURES MEAN ANYTHING I'M JUST POINTING OUT THE FACT THAT THERE HAVE BEEN MORE WITH TURBO'S
but tbh i think you would be happy with either route you choose, if you want the most potential to make power go turbo..
if you wanna keep your exhaust and stay carb complient (one of the reasons i went procharged) get the supercharger.
both setups are bad *** imo and you have potential to make some good power with either one.
oh yeah, and a lot of the guys who are selling there prochargers, seem to be moving on to different cars, a lot of guys upgrading to 5.0's and what not. the only people i know of who switched over from procharger to turbo was clamphier and solobusa.. and i'm the only guy to go from nitrous, to owing hellion (never installing it) and going procharged lol