Have you checked into the other marina? I'd think the added shelter would be worth even some added cost.... and this one's cheaper!
Of course there may be other factors - facilities, docks etc...
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)