Good night everyone.
Recently I got level 120 with my Priest, and I really want to run Mythic+ being healer, but I am in doubt if I go Discipline or Holy.
The big problem with Discipline is cause I don’t know if the AoE heal is strong enough to keep players DPS and Tank alive with affixes like Sanguine or Bursting.
I know that we have a Trait that increseases Power Word: Radiance, but is it strong enough? Or maybe should I go Holy? I’m in doubt because maybe I would prefer Discipline because I can DPS a bit and it is nice because of the Timer but I don’t really know if I can actually heal. Can someone tell me about your experiences?
I know that everyone got their preference but I really want to hear about all your feedback.
Thank you! 
Also sorry for my bad english!
In all honesty you won’t have great fun with either if you pug.
Disc is the better spec but its very hard to play in M+ and some affixes don’t suit it at all. (Hard to atonement heal bursting when the mobs just died for example)
Holy is by far more straight forward but it doesn’t do anything amazingly.
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I’ve tanked a few M+10s with a disc healer… please, don’t spec disc for M+.
From my experience, even a less-than-average healer can keep up an otherwise good M+ group. For Disc, from what I’ve seen, you need to be exceptional to pull it off.
So unless you’re that good, please don’t go disc.
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If your group isn’t standing in stupid, and it’s not Bursting, go Disc otherwise Holy.
Your other progression method is to play Holy till you get bored with not having enough to heal and wanting to do more dps, then go Disc.
If you/your group are still learning the dungeon(s) you’ll have an easier time as Holy.
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If you are going to pug go holy. If you have a good group will to stick with you, disci is better.
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Pretty much this. Disc has a horrible time dealing with unexpected damage, especially if it’s heavy damage. But if you run with a set group of people, you will eventually learn what they tend to take damage from, so you can prepare for it.
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Disclaimer: If you want to be competitive in M+ as a healer, level a monk or druid instead. Both priest specs are very bad at M+.
That said, Disc is generally better at it than Holy. You contribute more DPS while generally also healing more and on top of that you have very strong damage reductions in the form of Pain Suppression and Barrier.
I found that Holy has a useful niche with the Flash Heal build (stacking Promise of Deliverance and Permeating Glow traits and speccing into Trail of Light), which let’s it heal a lot on 2-3 targets, but that kind of damage pattern is rare.
Disc is perfectly fine at healing unexpected damage by the way. I don’t know why people keep saying this. In M+, you press Radiance and everybody has Atonement. You don’t have to ramp your healing like you do in raids and you aren’t even able to do that outside of Rapture.
What Disc doesn’t really have in M+ is burst healing, especially on single target, which is why it struggles with Grievous and similar mechanics.
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Yeah, that’s why I don’t know If Disc is so good with affixed like Bursting because I find Bursting very difficult to heal with some classes. 
I only Holy Priest and up to 12’s + runs are fine, the main problem is who you are running with. Running nasty affixes are np with the right people whereas with poor pugs its virtually impossible.
As always both are viable and its more about doing it the way you want to and you’ll get so much more out of it…
I get the max out of my holy priest love it and wouldn’t swap for anything in wow, but each to their own and both will work fine with enough enthusiasm to max them and your play style
V
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no1 will invite you to higher keys. To the point i stand in the orgrimar and call all resto druids bad names. If you plan on playing +16+17+18 keys go play druid paladin or monk.
Discipline is OK, m+community just dont like it.
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Depends, if you’re pugging i’d go holy 100% since most pug people just think ‘‘hurr durr, healer heal’’ mentallity & stand in stuff constantly ( Like sanguine ) Holy priest would be a hell of a lot better compared to disc in pugs atleast
In pugs btw
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People tends to go for the easiest and simplistic game play that can compensate for mistakes, neither of the priest provide it compared with other healers.
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For whatever its worth. Ive recently boosted my priest to 120 and have done quite a few M+ (up to 9+) this week as disc and holy. I started as disc and whilst I could just about manage it with the gear I had (415ish), its way more difficult than it should be. I switched to holy (not played since MoP) and found it way easier to keep the group alive with all the aoe healing.
As people have clearly pointed out above and from my own experience starting out as a priest healer, holy is definately the better pick in PuGs in M+ as you can more easily and readily respond to the random damage. With disc, its more about preempting the damage with barriers and shields before it comes in and so its less forgiving when PuGs take damage when they shouldnt.
Edit - I should say that i havent healed other affixes as priest, and so more single target orientated damage intake may favour disc. Especially with contributing more damage for tyrannical weeks.
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Sadly now both priest specs are very bad at M+.
Holy in particular has the problem of suffer from low heals (outside the CDs). Flash heal is sooo low that is ike a joke.
Other problem of holy is keep himself alive. compared with the other healers, he is bad on that
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If we are talking keys below 10-12 and you arent with a useless group priest isnt really that bad. I cant speak for disc as I rapidly learnt that its not viable for pugs as folks do stand in the fire far too often so never really bothered to play it, especially as holy is such an easy spec to play.
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Same problem on this one 
I actually did work on a resto druid, but I stopped. I found the gameplay too boring for my taste, and I just missed playing what i LOVE to play most. And I do try to not play that much pugs, but even non pug runs can go bad sometimes, healer a WM+15 today…didn’t go very well, but we finished it.
I just refuse to go and play a meta just for the sake of it.
So in legion I played Discipine, in BfA I played Holy. I really like playing holy, discipline I found a it stressful, but admit I didn’t try much in BfA. Atm my priest is Shadow though, these damn heaing essences… 
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Laughs in conflict and strife
Stun immunity to a player means more dps uptime babyyy
Still doesn’t make priest good. Especially since one of the problems Holy priest has is lack of dps and you sacrifice Crucible major to run Holy Ward. Not worth it.
Not to mention I can’t recall a single dungeon where having a CC immunity would make a difference, vast majority (if not all) hard CC from the mobs can be dodged.
I made a long response but honestly i can’t be arsed having this discussion with another person AGAIN
Long story short, if healer dps is all you care about, then maybe holy priest isn’t for you
Also depends what you mean with ‘‘Good’’ pushing +20’s or just going for the +15 achievment? or doing weekly +10?
I never said healer dps is all I care about. But for pushing high keys, healer dps is an important aspect. Pretending it’s not is just stupid.
By good I mean in the terms of what priest brings compared to other healers. And sadly, they bring pretty much the least of all healer specs. Mediocre dps at best (and Holy has to sacrifice healing for damage or vice versa), lackluster ST healing, bad personals, not really useful utility and Holy’s external is not great either, unless you happen to be specifically running a Blood DK. At least Disc has Barrier and Pain Suppression but it still suffers from the other problems.
Doesn’t prevent you from doing keys tho, any spec can do +20s in time, but it doesn’t change the fact that priests are just plain bad compared to other healers.