Sailboats are the best value. They are usually more fun for kids. The crews are good sailors and generally younger. With sailboats, most of time you get a cabin with a berth and a shower, on power yachts you can get a large stateroom with a king or queen size bed and a bath tub. One of the best things about sailing is that don't have to pay for a ton of fuel.
Catamarans have some nice advantages.
Second, you get a lot of extra room, and they're very fast. They draw very little water and can get closer to beaches. These boats are becoming more and more popular every year. You make the plans and the itinerary is completely up to you. Depending on the yacht's capabilities and the weather conditions, you can go wherever you want.