tuning is harder for a turbo. as far as the procharger installation, i don't know. Its going to be more involved because you also have to install an intercooler and a battery relocation box. but then you don't have to tap into your oil pan or bend a/c tubing lines.
I would see if you can get your hands on a procharger install manual/guide. you can see vortechs on their site.
also a big plus for a supercharger over a turbo is that if your having problems with the supercharger you can just take the belt off....turbo you can't, its either working or your car isn't