according to transworld snowboarding, a wider stance should be for powder and a close stance (measured by your knee to your ankle) is a better park stance. so i like to do close stance
wide all day it's just a matter of getting used to it and finding what your better at fuck transworld they don't know shit you learn with your own ambition and ability. I feel wider stance = better control easier rotation
technically a closer stance makes it easier to spin because you have more swing weight in the tips. i personally ride more in the middle, def not super close but not wide to the point that im going to blow my knees out either which ive been seeing a lot of kids do now a days.