I know for sure I don't like duck because it strains/is uncomfortable for my mcl(no prior injury) on my back leg. It's totally dependent on the physiology of the individual. I'm ok when totally square to the board, but if I look down the mountain with a little shoulder/hip rotation, forget it. My toes don't naturally point out when I turn my body/rotate my shoulders in a snowboarding position. I can do squats ok in a slight duck stance, but that's because my entire body is facing completely forward with no rotation.
Your basic snowboarding position should be totally square to the board. You should be rotating your head, not your body/shoulders.