The absolute best answer doesn't seem to directly reply to the question.
The safest
boat in a nasty blow is the one crewed by a prepared
skipper. That doesn't mean possessing incredible amounts of experience, or intangible seafaring skills. It just means someone who understands some fundamentals (how to heave to, how the specific
boat handles in windy conditions, how to run away from a storm instead of into it, etc..).
The other important part of the equation is preparedness. Having the proper
sails, spare lines, shackles and blocks, and a serviceable sea anchor/drogue are far more important than the geometry or
rigging of the boat.
All well-made cruising boats can handle rough
weather, if you are well-prepared and know the protocols specific to your boat.
So the simple answer, as hinted at in a previous post, is this: whichever
hull design has the best prepared
skipper is the one that will handle adverse situations best.