I believe the consensus is that you always want the best one, until you get Turgur's Insects. For many fights the 75% of Turgur's, at a cost of 250, isn't worth the extra 75 mana for 5% more slow compared to Togor's (70% slow for 175 mana).
Personally I just use Turgur's for everything though. We're Shaman, we have Cannibalize and (at 60) Torpor: we have mana to burn
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