I main SCH and run WHM time to time. I feel much more in control of a fight as a SCH than a WHM. It is satisfying to have health bars barely move after an attack. While as a WHM I feel more at the mercy of the fight. Sure, I can pre-cast when I see a critter getting ready to hit someone. I also stance dance. However, SCH just feels more in control and calculated with shield placement and dps.
I am not one who likes big numbers. If we maxed out at 1000 hp and everything scaled accordingly I would be happy. Big numbers strike me as silly, but to each their own.
WHM does have hate issues that can be a little challenging to manage if you are not paying attention, but then I've had DOTs peal critters off the tank as a SCH too. The WHM hate mechanics is actually a way to keep MP consumption in check from my experience.
Now if only Shadow Flare was like a dark version of Holy that consumed Aetherflow instead of being a pool of blue....
