Depends on your boating.
If you're staying in the States and will own it awhile, I'd get the shotgun that has the most corrosion-proofed parts.
If you're going to cruise the islands outside the US, I'd get the cheapest model. It's likely that you may have to toss it over the side before entering some ports.
Either way, get one that stows well. Like a fire extinguisher, you never use the thing.
If you're staying in the States and will own it awhile, I'd get the shotgun that has the most corrosion-proofed parts.
If you're going to cruise the islands outside the US, I'd get the cheapest model. It's likely that you may have to toss it over the side before entering some ports.
Either way, get one that stows well. Like a fire extinguisher, you never use the thing.