This Thing You Call Aggro.

[Treesh]

I usually use grace of air.  It gives me 5% to crit, and with flurry that is almost an extra hit, plus the damage of the crit.  Also, the bonus to Parry and Dodge.  The key thing is that those bonuses apply to both you and the warrior, where as only the warrior benefits from the windfury totem.  And it overwrites his sharpening stone.
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I frequently use both grace of air and strength of earth simply because they do help the hunter pet, the hunter shooting and me meleeing. When we get other people in the group with our dynamic duo, things change a bit, but most of the time it just isn't worth it to plop down a windfury totem for just us two (three with the pet). If I want it on my weapon, I can just throw it on my weapon since it only really helps me in most situations anyway.