a cleric stanced whm will have roughly 25% more int then a cleric stance sch, and while both potency are about equal, sch can't push it because they are dots, while a whm can spam on burst. Whm is by far the better damage dealer, anyone burning walls will tell you that.
Also keep in mind that the stats boosts to the arcanist are native INT boosts traits (unless this was fixed ?) which does not benefit a cleric stanced SCH.