For my unholy DK, you rank Storm-Eater’s Boon almost 3% higher than Manic Grieftorch. There’s a definite problem with the Storm-Eater’s Boon in that you can’t move while it’s casting, so there are often situations where it would be dangerous to use. The Manic Grieftorch doesn’t have that problem.
Do you consider the likely less frequent use of the Storm-Eater’s Boon in deciding which of these trinkets is better?