Originally Posted by
wkrueger
As Ghostcrawler recently said when he revealed ha plays Holy, Holy can do things Disc can't (ofc the other way is also true).
Holy will have lower healing done since no shields, that doesnt mean that it is actually bad. It has insane burst healing capabilities. Maximizing it is way harder than disc. Mana management is tight. It is probably the most mana hungry healer in the game.
If you feel while playing disc that while your HPS is high because of atonement shields, you are useless healing damage bursts, you might give holy a try.