Not just "rough seas" either. There are way too many variables to realistically put forward any more than generalizations on this subject. The skipper, the individuals tolerance for "banging", the speeds at which the individual likes to travel, the set up of the boat, the specifics of the sea on a given day. There would only be one way to put the argument to bed - which is more or less physically impossible due to the sheer cost that would be involved in taking the human element out of the equation for a direct side by side comparison on the same day with remote controls and shock sensors. Even then though the results would be specific to a set of conditions. It's an argument that will keep on keeping on for as long as people keep boating until some smart bugger manages to make one that floats on air.