To my knowledge, there are no other 20 foot production beach catamarans beyond the Nacra F20 series. The only other real option I would think is the Flying Phantom line, the Essential could beach/launch land relatively easily given the z-boards. Some of the new F18's have convertible trunks (Nacra and Cirrus), so to me that still remains the best option as I suspect a z-board F18 is going to be fast in breeze on reaching conditions in the right hands. Is the F20c a better overall boat still? Probably, faster in lighter conditions, more waterline and width, but again, small class.