prism, execution or aoe?
Here's how I generally think of it:
Single target boss? Execution Sentence.
Large trash pull/boss with lots of adds? Light's Hammer.
Small trash pull/multiple bosses? Holy Prism.
EDIT: That's as Ret, BTW. Your mileage may vary for other specs.
In which case, Execution sentence is the best dps of them all. A large reason for this is because the minute cooldown times perfectly with all of your other cooldowns, like Avenging Wrath. 50% of your Execution sentence is gaining the buff, whereas only 16% or so of your Prisms would be gaining the same. As well, there's the added factor that Prism is rarely able to be used on cooldown because it's a filler move, so you end up losing a couple over the duration of a fight. Execution sentence/Hammer will be pushed back as well, but less frequently.
The healing from Prism and Hammer shouldn't be ignored, but it general your healing is unlikely to make any difference in a raid. If you end up healing, say 15k damage to a few targets, odds are that this will just push your healers into overheal at some point. Caveat: Light's hammer can be a good choice for when raid-wide damage is causing a wipe or is deadly, such as on Jin'rohk or Megeara. But it's for you and your raid to decide whether subpar dps is worth the minute healing gained.
Light's hammer is better dps than ES on fights with many adds/multi-bosses, when the adds survive long enough, but that's a case by case basis.
1. Execution sentence is great on bosses. It does not compare to the other two in terms of aoe or splash healing.
2. Prism is good for consistent burst of heals or dps depending on who the target is. This one can see some use in pvp and solo/scenarios.
3. Hammer is good if the enemy or the party are bunched together and stay in it. Not the best option for single target or things that move out of it.
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