Grizzlefoot
Legend
Disc > Holy. At least in pugs.
Disc gets more base mana, crit and more spell power, while holy gets more healing. Not a too huge difference here.
Disc gets 6% damage, 6% healing, and 20% increased absorb amount with PW:S. Holy gets 15% increased healing as well as 10% increased healing with renew. Not a too huge difference here either.
Chastise and DP does not in any ways compete with penance. Chastise breaks by any damage, 25 sec cd, and DP heals you for ~500, with a 2 min cd. While disc priests get penance, each tick healing for almost 200 (or 400 if it crits), meaning a full penance heals more than a DP.
"Let the dps do the damage", why? If you can do more burst damage than most classes, why not take advantage of it?
Also, disc gets a 1 sec shorter shield on PW:S which is great for group healing both on O and D.
If DP is one of the biggest benefits of Holy, then holy definately isn't worth it.
This is just my opinion and it's up to you if you'll agree with it or not. You will probably not change your mind, and neither will I.
you mean that you can do insane healing and burst harder than most classes? sign me up for priest