Do me a favour, if you are in Sorrento go to Raki Gelateria. They do some of the best gelatos I have ever had! I mean look at my face while eating a scoop of Mascarpone & Pine Nuts (creamy heaven!) and a scoop of Pinneaple & Basil (sorbet of dreams!)
Also if you need more convincing, check the TripAdvisor reviews!