Try comparing talents with the sim to find out which is best. And use the scaling or plots features in the sim to find out which stat is best.
Here is my question. Mastery vs. haste, AND PE vs. UF. Ive tried both of these specs, WHILE stacking haste on both of them. Tried them both out while raiding for 2 weeks. What ive found is that depending on what spec you use, is determined on what stat to stack.
Haste and EM works best with UF. And mastery works really well with PE. I dunno. It REALLY just depends on the gear you have, and your what stats you stack, and the spec you choose. I don't know why everyone uses Echo Of Elements though? From when I tried it, it NEVER out dps' Elemental Mastery. Just from what Ive gathered with the gear that I have.
Anyone have anything different??