Travel to Turin or Verona/ Venice?

We re planning a short trip (5 days) to northern Italy in a few weeks. We will land in Milano and also depart from there (all booked already) and we intend to spend 1-2 days there, but we haven' t yet decided if it is better to go to Turin or to Verona and Venice for the rest 3 days. I have already been once to Venice, but only for one afternoon, my friend has never been there at all, and none of us has been to Verona or Turin. I want some opinions on what would be best to do, by people who have traveled there or local italians and also maybe a short "description" of each city' s atmosphere and advantages. Thank you!