If you only had the choice between going to Capri, Italy or Sorrento/Positano, Italy which would you go to?

Either place is very nice. Sorrento and Positano are on the mainland while Capri is an island. I think I would pick Capri if I had to choose rather than visiting both places. They're both pretty touristic, but Capri is very scenic and has the Blue Grotto which is interesting. I particularly like the Garden of Augustus there. If you do go be sure to go to Anacapri on the bus and visit the Munthe villa there. You can also take a lift up the mountain for even more spectacular views.