Catamarans are by far superior. Cats are unstoppable. Even when completely loaded with cargo and passengers, they have natural buoyancy. The deck could be filled with water, and the catamaran would still float, with the deck staying flat. By a nautical mile, Catamarans are better. Cats seem unsinkable. They have a natural buoyancy even when fully overloaded with passengers and cargo. The deck can be flooded with water, and the catamaran floated with the deck still flat.