I bet contacting the manufacturer will tell you if the only difference is the coating.
In any case, I would chip out the couple extra bucks and get the coated thing. I say so only because I sometimes do the maintenance
for others and I can see the sort of problem one can expect in less than optimally protected alloys.
In any case, should you be persistent enough and go for the land version I do suggest you take out all joining screws and other SS elements, cover them with an isolating compound, screw back in, and then paint the holes over. Any access of salty spray to this SS/alloy area tends to result in sudden white death.