You'll love the Mojo. It has a surprisingly large amount of storage. Nice thing, the wakeboards and surfboards, ski's all fit in the rear lockers when traveling/towing. I had a similar size crew, the Mojo handled it nicely. It has a good size bow, the older kids would always sit up front, anywhere from 3-5 teenager's up front in bow sitting area. Lots of underseat, bow and under observer seat storage for all the coolers, snacks and towel bags. For your needs, it is a no contest, Mojo all the way.
2020 Supra SL 400
2015 Moomba Mojo(Sold)
2018 Yamaha Waverunner(Just to fool around)
2018 F150 Lariat
sport edition, 3.5lt ecoboost