It may also pay to go "long". I don't know the exposure in your expected moorings but what makes for great clearance for the swim platform on weekends so Mamma and the dogs can get aboard is rotten in a storm.
We were in a large marina after Hurricane Opal and divers were recovering swim platforms from the bottom for almost a week. Most people did not think to adjust their spring lines to move the boats forward and the piers snapped off nearly every swim platform in the marina. As in this case, having the room doesn't mean careless or thoughtless boaters will use it, but not having it makes it impossible.
As a matter of fact we found two teak platforms floating in Pensacola Bay a few days after the storm. One became cabinetry in our Atlantic 44 and the nicest one is now a 6' 8" coffee table in our living room.