The Annapolis boat show will have the most exposure and almost every type will be available to board. It can be difficult to compare different charter programs since they all have different aspects. When you are presented estimated numbers for shared revenue programs try and back them up by seeing actual performance numbers from boats currently in their fleet and ask to be put in touch with the owners to verify the numbers. I had a boat with one company where I was assured I would see 25 to 30% of the gross revenue if the boat did 28 weeks of charter. They emphasized that since they built the boat they knew the expenses down to the dime. My boat easily exceeded the 28 weeks but my actual net was about 9%.
Make sure when you enter a contract you have a clear understanding of how insurance will be handled and at what cost. Understand what happens if the boat is out of service for repairs. There are substantial differences between companies. The last thing to clarify is if they permit the sale of owners time and what the rules and restrictions would be. This can make or break the financial side of ownership.