When I last was racing with the kites, they all had the three fins, but they were all very interested in the formula boards and their fins. The one significant thing that I noticed in the strong winds (25 knots and 4' chop) is that the kites could luff their rigs high above and de-power to stay in control while the formula sailors just had to hang on and hope they didn't blow up. I did on one race and gave up for the day.
The potential for kites to be faster (if they aren't already) than formula boards is high if in the right conditions.
Formula 160; iSonic 111; HiFly Move 105; Tiga 263; '85 Mistral Superlight.
Maui Sails TR 11.0; 9.2; 8.4; 7.6; 6.6; Maui Sails Switch 6.0; 5.2; Maui Sails Global 4.5; 4.0.