We are family of 4 ( 2 Adults, 17yr, 14yold) planning trip to Europe. Will be travelling from Paris to Rome and then with in Italy Rome-->Pisa, Rome-->Milan, Milan->Venice. Would we be better off buying Trenitalia Pass or Eurorail pass ? I am hoping if we buy Trenitalia pass, we get to use it on trip from Paris->Milan->Rome. with Trenitalia pass do we still need to pay for seat reservations ?