My vote would be for Roatan - having dives both from the ship. RCCL uses Anthonys Key in Roatan. I enjoyed them so much we went back for a week stay at their facility. They problem with Roatan and Belize City is distance and dock time. RCCL at Belize picked us up at the ship - we never docked. The tender service at Belize was an hour just to get to shore. At Roatan - there is about 40 minutes round trip of travel time to the West End - if that is where you are headed to dive - plus coordinating your arrival with the shop to catch their boat. I would say if I had to choose - take Roatan and AKR if that is the cruse lines operator there. IMHO.