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About healers
Well, some days ago i decided to make a healers class to run with some friends, choosed mystic cuz it seems to be flavor of the mouth but i started to die in some dungeons before 60s, so the priest tend to fit better for me to stay alive? And about the base HP, priests have higher? They buffs can even get closer to the mystics auras? I just want a little explanatiom about this. Tyvm guys! 
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Gear/crystals aside, Mystics tend to be required to dodge around a lot more and keep moving to stay out of range of boss attacks, whereas Priests are more capable of keeping themselves alive even in the thick of things, due to primarily Kaia's Shield and Heal Thyself. Mystics by contrast don't unlock the equivalent skills/glyphs until they get to around level 58 or 60, though they can use Thrall of Life from early on which gives a great deal of healing to the Mystic themself, or they can simply pick up one of their own motes.
Overall, Mystics tend to improve a party's dps by more than a Priest, mainly due to their double-crit aura, but a Priest is more capable of keeping everyone, including themselves, alive. Mystics are far more capable at healing than ever before due to the last few patches, but they can never match the sheer survivability and healing output of Kaia's Shield or Healing Immersion, respectively.
One shot all day on boss rooms.
Basically tho, if you got hit on Mystic and died, you probably would on Priest too unless you used Kaia's before.
On the other side of the fence, priests have kaias shield and guardian sanctuary to let them facetank hard hitting skills. They have divine respite, which from the skill description looks like [filtered] but it'll actually keep you alive and well through just about any situation if you use it while you're in a bad spot. You have fiery escape for hopping out of danger spots and backstep for iframing. You're always in combat if you're doing priest right, so you kinda need to have two ways to move from point A to point B.
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In my totally biased opinion, I think mystic should have less survivability than a priest. Mystic brings a lot to the table right now (massive damage boosts from auras, comparable endurance debuff that lasts twice as long as a priest's, an extra endurance debuff, contagion, to help during shield/burn phases, an auto res that can res half the party and has a short cd when glyphed, an arsenal of comparable heals and support methods, a skill comparable to energy stars that has 100% effortless uptime thanks to it being a passive, and that's to say nothing of their potential for DPS'ing in duo heal groups), so all of those benefits should come with some kind of downside. Priests have more healing tools at their disposal, but as a counterbalance your party loses a lot of crit factor and overall DPS. They play it safe so they get less damage. The reverse is no longer true, however. Bringing a mystic isn't a high risk high reward investment anymore, because a mystic's healing support capabilities have been buffed to the point of making priests seem redundant. If anything it's a moderate risk, massively high reward. And it gets even worse when you realize that a priest's buffs do not require the priest to be in the group or anywhere near the party for them to continue working, which allows many people to just take a mystic, grab buffs from some kind priest outside the dungeon, and then do the dungeon using the help of the priest's buffs, without the priest actually being there to, you know, actually run the dungeon.
My point isn't to rant, because at the end of the day most people just take both a priest and a mystic anyway. My point is that mystics have a lot of good [filtered] going for them this patch, while priests seem to represent a healing class that asks its group to give up bigger damage in return for safety. In this regard, priest should be the class with a multi-person vow of resurrection, not mystic, and priest should also be the class that has an easier time staying alive. Again, it's all moot since duo heal is the big thing everyone goes for anyway, but in regards to pure class balance it's so [filtered] stupid how cushy mystics are compared to how much they can also do for damage output. I've made both classes and I play them both, and just looking at it objectively this is terrible in terms of actual balance. For me, in like nine out of ten dungeons my mystic is easier to play than my priest just because I'm out of combat so often or because I can facetank with CR every 10 seconds, or because I never have to care about being staggered or iframed out of estars, or because volley lasts 20 seconds, etc. etc. That's stupid. The healer that rewards my team with more damage shouldn't also be [filtered] easy to play, otherwise there's basically no reason to make a priest. And again, duo healing being the new fad makes this moot, but then you look at ktera class change notes where they say they're gonna try to phase duo healing out altogether, and ...
Priest pros:
*huge amount of healing - aoes
*aoe dispell (on instances like MM this is really important to have sth like that)
*Kaia shield, which can save the life of your party in hard situations (like steping on red indicators inside imperator's cage in SSNM)
*priests have better selfheal, with crit you can heal half of your hp
*buffs
*energy stars (this is a substitute for mistyc's auras)
*your party doesn't have to take care of itself, becouse priest can do everything - give thrm mana, heals and debuff for boss(if glyphed)
*you can move while using your skill, which gives mana
Priest cons:
*backstep ;_;
*beeing always in combat
*you can autoress but only yourself
*when you are dead - your party is dead, you can't heal after death
Priest is good healer for noob's party.
Mistyc pros:
*auras
*endurance buff
*motes with cleanse, heal and mana
*endurance debuff (if glyphed)
*teleport as your ifeame
*boomerang - it heals a lot
*healing totem
*you can heal after death using motes
*you can use res for you and someone, so you don't have to res people everytime they die
Mistyc cons:
*nearly useless thralls (don't get it wrong, but sometimes they distrupt more than help; only thrall of wrath and your healing thrall are usefull in dungeons, becouse rest of your thralls dies immadinately after summon)
*lack of selfheal (your selfheal lasts much longer)
*you need clever party (they should know that motes can cleanse them)
*harder cleanse (you need to lock sb)
*your res is animation locked for a long time
Mistyc is better for pro partys
If you are dying a lot I think priest is easier to play at first and most of partys prefere to go with priest or priest & mistyc. But the decision is yours.
Thralls aren't that useless, I often use thrall of vengence to pop Prima's trap on the first boss in demokron factory (of course he dies instantly but the trap is gone), which is useful if someone without a block is distracting prima. On other bosses if you position vengence right he often does not die right away. I also summon him for shields cause it's an instant summon and I don't always have time to summon wrath depending on the situation during shields (or wrath is on cd). Thrall of protection is useful for his grounding glyph and lives longer then vengence typically.
@Kiara146 Priest have animation lock on focus heal, cleanse, healing circle and some others. The priest cleanse is actually a longer animation then the mystic one (and shorter range cause it's a circle).
Thanks for correcting me about priests animation, I don't want to give people incomplete information.
The biggest challenge I've faced as a Mystic is targeting party members and being aware of exactly where everything is. When spell effects and bosses are blocking your view due to a bad camera angle or something it can be a pain to focus heal. This applies to the mystic cleanse as well. I got Boomerang Pulse at 63 (why do they keep giving us core skills so late?) and I'm having trouble targeting with it. I know there is a bug which makes it shoot below the crosshair, but its tough targeting even when compensating for that cause I have to fiddle around with the camera.
The totem is quite nice since it can take some pressure off of you while you heal the critically injured up. Thralls are great as they can fit multiple situations. I also like the 10% endurance buff glyph on the Thrall of Protection.
I love the passive Mystic auras.
I mostly drop motes intending to use if myself cause 99% of IM people do not pick them up. I spread them out for "oh [filtered]" moments since I tend to move around a lot.
After I stopped playing my priest like a Mystic, I did start liking her quite a bit. I use healing circle as my main heal and focus heal for spot healing or to get the range dps on the other side of the room. I like that it only requires me to face the direction I want to heal. This also applies to restorative burst, the cleansing circle and kaias shield.
I still do practice focus healing when I can, especially on Elin, but I know when I can't get a lock on them I can just take a few steps forward and use healing circle.
I hate the priest buffs. They have a small radius and require party members to STAND STILL. There is always one member who does not stand still and wonders aloud why I don't buff them. Also a few times I was in town doing something on the broker or bank and someone says, "BUFF". Yeah sure, I'll drop everything so I can buff you immediately.
I didn't get healing immersion yet so we'll see. I heard it's the priest's main heal...but it has a base CD of 20 secs which I'm not crazy about.
TLDR: If I can get the targeting on Mystic heals down, I would main Mystic as my healer no question. It offers a lot more to the party. Self healing is less of an issue since you can stay of combat if you don't get hit. It is easy to run out of the way.
If I can't get used to targeting my big heals I know that I have a solid healer in the priest with spells that are easier to target. It also doesn't hurt that they are expected to be changed(buffed?) in the future.