My opinion FWIW is that a crew of 15 is going to be crowded on either of those boats (full disclosure I have not set foot in a new Mojo). As stated above 15 on the Makai would even be tight but your other crew size of 10 would be comfortable. I have had 10 adults on my boat and it was very comfortable and enjoyable. Have you built a Mojo and then built a Makai and checked the price difference? Some of the options you are talking about are more expensive on the Mojo vs the Makai so the delta wont be as much.