Unless a new city will get new resources within our borders, I think that ships is the better choice. Better to protect to make sure the cities we have are defendable, rather than creating new ones.Port Tropicana has just finished the missionary for our Iron city. What's next: a settler to keep the expansion going or some ships? Another Caravel can go on patrol in the western ocean or a Galleon can take te place of our old Galley. Piffle could show up on our east coast and we'll need some way to get troops there from the west.