Last sunday it was snowing like mad and blizzard like conditions for certain short spurts, my Smith I/Os, my friends EG2s, and another friends Oakley splice were either froze or fogged up, but my wife's Dragon Maces held up totally fine... idk.
Turbo fans are the way to go. They will fog up, but man you have to be working hard to get that to happen. I use them for splitboarding. It's rare that my Turbo fans fog up, even on the the toughest of hikes. They work, and for resort riding, there is probably nothing better.