[camp guy]

The choice between stainless chain or galvanized chain can be determined by several factors. First, and most obvious, your personal tolerance factor for something to go wrong and your boat floats away; second, your ability to keep watch on your mooring hardware (depth of water, etc) and monitor the corrosion/deterioration of the chain; and third, not at all insignificant, the relative cost difference based on depth and necessary hardware.

Personally, I had zero tolerance for my boat floating away, and, even though the water depth was modest, I decided to spend the money to (at least) feel safe about my boat when I wasn't home to watch it.

Good luck. Remember, it's your boat.