Catamarans are usually much cheaper than motor yachts for charter In Croatia. The main reason is because they are cheaper at buying one. Also the catamaran with his four cabins and four bathrooms can accomodate up to 12 people that includes also the crew if needed. The motor yachts are usually arranged to accomodate up to six crew members in three cabins. In Croatia the islands are really close one to another so there isnt any obligations to have a fast travel yacht to get to all areas, you can get there with any model of charter yacht.