Tuskarr's Vitality vs Icewalker

You will go 8% faster, meaning:

1) It'll be easier for you to avoid damage, therefore you're helping the healers.
2) Its a DPS gain: you get out faster, you resume DPS faster. Plus: if it saves your life, can you do the math how much DPS you got there? Consider a dead dps is 0 dps!
3) As a healer, it will help you get in range and throw that heal that could save the raid from a wipe.
4) There are a lot of hit gear in Ulduar, Icewalker is not NEEDED to get the hit cap.

Depending a bit in your own guild strategies, this is very useful for fights like Yogg and General (main examples).