If you're going to be in the Exumas
already, a mooring
just fine for you.
If you plan to be elsewhere in the Bahamas, there may be better places to store your boat.
For example, I would not consider Nassau
because of the rampant thievery there.
If you plan to be in the central Bahamas, Bullock's Harbour on Great Harbour Cay, is a good marina choice, as would the private marina on Chub Cay. Both are well-protected from the elements.
If you plan to be in the northern Bahamas, there a number of excellent marinas
fields, and even dry-storage yards to choose from in the Abacos.