You can run either gear with a supercharger down the road. The 4.10's will be a lot more aggressive, so you'll need a stout performance suspension to keep traction. If you plan on doing so, than 4.10's is a great option. Also, you can always run a taller tire, if the ratio is too strong/short.
Otherwise, 3.73 gears are a great option. I think you'll honestly be happy with either!
Also, we don't have an installation shop at the moment, just Performance Parts retailing. Your best bet is to find another auto repair shop in your area.