Someone did the math on Reddit and it turned out a WHM heals 650 Potency every GCD, but a SCH would heal 850 with Fairy.

They may get a fairy but you said it yourself, "outside of that one HoT" - Why are you NOT including this? I see this everytime! People compare WHM and SCH, say SCH is superior in every way and then fail to acknowledge Regen is an existing ability (which FYI heals about 500 HP a tick for me. That's quite a bit!)