[Norm]

By staying in Cancun you will have easier access to the Mayan Historical sites without taking a 35 minute ferry ride from Cozumel to the mainland. Although the resort area of Cancun does not contain as much history due to its resort like nature, it is much easier to visit the main historical sites such as Tuluum and Chichen Itza when on the mainland of Mexico. I would imagine that being on Cozumel would limit you to the history of that island and require a ferry ride to get anywhere.