Raid healing 10mans:
Assuming the same skill level, assignment, and sustainability, when comparing the differences between the holy and disc on raid healing there's only two important metrics to look at: (1) Effective Healing per Second (EHPS) and (2) Practical Application.
(1) EHPS: the evidence from all the worlds public logs aggregated onto a single page of comparative data on EHPS shows no significant throughput differences between the two
specs on the latest content -- i.e., WMO Top
20 Scoreboard for ICC10.
(2) Practical Application: which spec is more effective in keeping the raid alive. Disc and holy heal differently and the majority position is probably that it depends on the encounter. I would disagree. As a general rule, preventative measures tend to be safer than reactionary measures; so in general, disc offers the more effective application than holy.
So, if you had to choose which spec to raid heal with disc should generally be the stronger option. It's throughput is just as strong while around 30% of it is the safer kind -- negative healing.
For further on disc vs holy, I have a more detailed write-up looking at this question for 25 mans: "Raid healing: to disc or not to disc."
So, if you had to choose which spec to raid heal with disc should generally be the stronger option. It's throughput is just as strong while around 30% of it is the safer kind -- negative healing.
For further on disc vs holy, I have a more detailed write-up looking at this question for 25 mans: "Raid healing: to disc or not to disc."