Young couple staying in Italy. Should we stay in Sorrento or the Amalfi coast?

This is really a matter of personal preference. the one advantage that Sorrento has is that there's a train station on the Circumvesuviana line as well as boats. the train has a stop at Pompeii on the way to Naples. There's a trip planner here: http://www.vesuviana.it/web/en . Sorrento is connected to the rest of the Amalfi Coast by boat or bus if you don't have a car. You can visit any of the towns along the coast and Capri fairly easily.