Originally Posted by nurofen
Comparing Mastery to Crit, you'd need 180 Critical Rating to gain 1% extra CS which means a flat 1% extra healing which appears to be multiplicative. 180 points of Mastery Rating gives you 1.25% extra healing which appears to be 25% more, but it is additive and requires harmony to be up (for HOTs), so at the end what is better? I personally believe CS to be better because it is "automatic" and works on all spells under any conditions (no Harmony required).
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Remember that in the case of mastery, you get 10 % healing as a base amount which in itself is enough that you should always keep the buff up and really never cast a hot when the buff is not up. I think when you consider mastery vs crit, the free mastery you get is what makes it better than crit since you can't really say no to a free 10 % healing increase.
Edit: My slightly more exact point being that you should never be in a condition where your hots don't benefit from mastery (and thus making mastery slightly better than crit). And remember: Regrowth always benefits from mastery so you can rather easily use that to refresh the buff.