Legal issues
If you own your boat alone, and use it just for fun, there is no reason not to have it in your own name. Obviously you want enough liability insurance on it, too.If you own the boat with others, then some kind of formal joint ownership like a partnership or corporation enables efficient selling of shares in the boat, and enables people to be bought out if they want to leave. Joint ownership of a boat, even by a non-married couple, can be very dicey on such issues without a formal agreement.Finally, if the boat is used a lot in connection with business, then it might be appropriate for it to be owned by that business and to be put in the name of the business, whether that business is an LLC, partnership, or corporation.