Both Sorrento and Salerno are attractive towns perched on hills overlooking the Mediterranean sea, both with historic centers with 14th-century sights. Sorrento, however, is much smaller (16K souls) and more touristy, while Salerno is a working small city (133k residents). Salerno sits at the East end of the Amalfi Coast, closer to the scenic villages of Amalfi and Positano. Sorrento is closer to Naples and to the popular attractions of Pompeii, Herculaneum, and the Ischia island.
Don’t forget to be awesome! Travel often. Life begins beyond of your comfort zone.