mmm think you already know my view on this one Adam.
The thing you really have to think about is that supercharges need recons (standard) every 30k but if they have had smaller pullys and chip then you will be looking at recon every 15-20k, costs vary too and can be very expensive to have them done. Turbo's will last longer is the engine is well looked after.
Like i said to you before adam, i have had a few cars with turbo's and they are amazing but this is my first car with a supercharger and love the sound of this so i am going to sit on the fence on this one and watch what the experts say
Having said that my bro use to have a mx5 which he supercharged and that was stupidly quick and with the roof down you couldnt hear yourself think but that sound was out of this world.