The price difference comes down to the stiffness, liner, grip pads... The only way to know if the stiffer boot will work for you is if you try it on with a boot-fitter. The flex is not dependent on where you ski, but whether or not you have the ankle flexibility, weight and/or strength to flex it. If someone else loves it for trees but you can't flex it, it won't work well in the trees for you. The boot that fits you the best will ski park & trees equally well.