Windfury totem is 20% chance to proc, and is worse than Wrath of Air even on a single target unless you have really extremely high amounts of spell damage. I made a post about it a while ago right here:
Shaman: Windfury
While the math in that post is missing a few key factors, I expect that the amount of spell damage required to make Windfury equal or better would still be far out of reach of what's viable even if you took all factors into account.