We'd like to visit Capri while in Positano this summer. For four of us, the round-trip ferry is just under $200, while a full-day boat tour (with four hours free to explore the island) is $400.
Other than price, any advantages or disadvantages to choosing one over the other? I've read that the ferry might be more comfortable on choppy seas than the smaller tour boats -- how much of a difference is it really?