SCH is basically the better healer because it excels in things that matter. Dps and Spreadlo for Ultimate. For general healing Sage is more mobile, comfier and has some better heals, but it doesn't matter. SCH brings enough for the fight, so it's not an advantage. When you have heavily scripted fights, mit-or-die raidwides and enrage timers, the things that help you beat that have huge value and the rest is just fluff and comfort.