We assume Slalom types are faster ;definitely case if we look at equal volume but compare eqaul width`s accross models and I`ll bet there`s not much in it.
On equal width the "freeride/freerace/freemove" will have that bit extra volume; probably needed more by heavier sailors.
Along lines of original poster how many photos do we see of Antoine Albeau powering to victory with a rescue craft in background or photo taken from rescue boat ??? Would all these racers choose the same boards if like the rest of us there was no rescue !!!
Good points from poster1.
I`ve got 3 boards in my van. Slalom;freemove;and a wave. Last year sailed 73 times. Freemove 48 times rest equally shared between salom and wave. Goes without saying which board I`d keep if I could only keep one and it would have been used 73 times. Cant say that about Wave or Slalom !!!