Seaworthyness is more about a boat than a type.
People have been going to Alaska in small OB boats for at least 65 years. And what's below the sheer is far more important than what's above. If someone would stake me for the fuel I'd take a Cruise-a-Home to AK w/o hesitation. I'd watch the weather a bit more than w the Willard but that's easy. Waiting for good weather on the hook would be far more challenging than scary seas. I've always heard good things about these boats.
North Western Washington State USA