It really is a coinflip - for PvP the stun immunity is useful, chances are as soon as you get Regen/Chloroplast you'll have that on you for extra regen anyway.
Snare necklace? Well, I don't know many fear kiting shammies, and not to quote myself but its a long cast time for not much of a duration (root/rot suits shamans a lot more right?).
PvE I'd say go with your preference, PvP I'd go with the ogre
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