Originally Posted by
iKrow
As of 5.4 the HPS charts are looking like; Resto Druid > Resto Shaman > Holy Pally > MW Monk = Holy Priest > Disc Priest
That being said Disc will always be viable, and absorbs will always be good. The Spirit Shell nerf severely hurts them in 25m, but in 10m it's much more forgiving. All it really means at the end of the day is get 4pc and about 3500-4000 haste and you'll never really notice a difference. In 25m it's a big difference, going from 6 base to 4 Spirit Shells is so harmful to pre-emptive healing. On top of that, most fights don't really have a 1 time burst mechanic, instead favoring damage over time effects (as they're less punishing on raiders).
Basically if you're a good healer, you'll get into a raid either way. Disc has more utility and CD's than Holy, but Holy will perform better, and Disc's cooldowns really don't mean much in a 25m raid setting.