In fact, skiing or snowboarding without ski goggles is unthinkable. Goggles not only provide protection from UV rays and the bright reflection of the snow up there high on the mountain, but they also shield your eyes from wind, rain, and splashing snow. They fit and protect much better than ordinary sunglasses because they fit well and are made of incredibly strong plastic that is virtually unbreakable.
Whether you choose a cylindrical or spherical lens is entirely up to you. But the right lens maximises contrasts and increases your depth perception under all lighting conditions. Well spotted!