The Futura93 has the performance focus more on flatwater blasting side of freeride/freemove, the Kombat96 really has the focus on the moves side of freeride.
Kombat is definitely more freeride-waves crossover.
So if you're on flat water, possibly(?) your normal ride style is more blasting - and the extra range and top end speed will be more compelling factors towards Futura93. Also being a heavier rider, the extra efficency of the Futura93 matches a little better for these two boards of similar volume.
Cheers ~ Ian