Originally Posted by
Endus
The only times you should be using Unleash Elements are;
1> You need an instant-cast spell and shocks are on CD and no Lava Surge procs are available (very rare and situational), or
2> You took the Unleashed Fury talent in Tier 6, which is based on Unleash Elements. This isn't as strong for Elemental as either PE or EB, but we mention it in the priority to be thorough.
An example of #1, for instance, would be when you know you have a phase shift coming up in a second, and don't have time to finish a cast of Lightning Bolt, and have no other instants available; UE will still hit and deal some damage, and provide you the buff, and your only other option in that situation is "nothing". UE is better than nothing.
Basically, because we've run sims both ways, and Lava Burst being higher on the priority provides better overall DPS. The buff to the LvB isn't worth as much, long-term, as getting more LvBs off is, basically, though it's a close enough call you need to sim both rotations to see the difference.