Solo Cleric Dawnfire vs Engraved Di'zok Deathbringer

[Sizar]

So once level 50, which is better for a solo battle cleric focusing on undead? Dawnfire with the sick sick proc, Deathbringer with the far better ration and Wis but the proc isn't close.

I know if luck is involved the Dawnfire just wrecks, but anyone spend a significant amount of time testing both to see which one overall felt better?