Basically.
Unless youâre going Krivis C3 or Priest C3, grab Cleric C2, even if you are going Krivis C3 or Priest C3 you may want to consider adding Cleric C2 to the build as its an immediate doubling of Heals healing output.
A little basic healing Info to look at them all at rank 2/3/4.
Everyone gets Heal 5. That is 10, 5%Heal tiles every 22 seconds or
2.27% health a second. Naturally you get even more health out of this via Int/SPR and the restoration buff (paladin or Scrolls)
[details=Rank 2]Cleric C2 has 20-22 Heal tiles so 100/110% /22 seconds. Thatâs
4.54 or 5% a second. Again you get more via INT/SPR and Restoration.
Safety zone gets an awesome attribute for defense.
Priest C1 cannot heal so its stuck with Cleric C1âs 2.27% unless you took Cleric C2/3 beforehand, but this is Rank 2 discussion 
Krivis C1 has Aukuras, which is also purchaseable via scroll. Anyways Aukuras 5 cuts your time between hp recovery ticks in half, It throws +45 hp recov on top of that, then another 75 via the attribute. Also gives 38% accuracy down to enemies. The healing power of this is very suspect and hardly reliable given the massive cooldown. If youâre not in a real stationary environment youâll end up abandoning your torch.[/details]
[details=Rank 3 heal output]
Cleric C3 has Heal 15 and it can go to 16 with Divine Might, thatâs 150 or 160% /22s. 6.82% or 7.27% per second respectively. Again Int/SPR and restoration will improve the amount you heal. Guardian Saint is also interesting to play with.
Mass Heal is 18% every 30 seconds but it heals 5 people simultaneously so potentially 4.1% a second. Together with C1 cleric thatâs 6.38% health gained a second and it can resurrect allies. Note Priest is fairly protective.
Now 6.38% is quite a lot, but the 4.1% its based off
Aukuras 10 will reduce the timer between hp recovery ticks by 62.5%. The hp recovery boost isnât much either. Accuracy down effect gets set to 48%.
Its possibly to have 2 Torches going around at the same time, still rather clunky. Itâs possible to get a better idea of how much recovery % you gain from Aukuras but meh. Real deal here is that Meltis is super strong as a support move and can hypothetically keep people safe.
Note, the cooldown recovery from Dievs statues also means the health per second of Heal 10 (11) is increased due to being able to put out more heals in a shorter timeframe.[/details]
[details=Rank 4]
Outside of choosing pre-existing Ranks the only other healing skill available at rank 4 is Restoration. You can purchase these scrolls but if you dont want to, Paladin has the skill. Restoration besides increasing HP recovery and increase the heal output of Heal, Mass Heal and Aukuras.
Anyways Mass Heal is 28% up to 5 potential targets so 140% / 30s.
Thatâs 4.67% Mixed with 2.27% youâve got 6.94% healing per second (potentially). The inflexibility of Mass heal (as people donât take damage all at the same time) can be a bit of a pain to get people health exactly when they need it which is why Priest is often paired with Cleric C2. For raw healing capability, a Priest C3, is just inbetween a C3 cleric not using Divine Might and a C3 Cleric using Divine Might. Again when people are taking damage independently however, thereâs a big practicality difference in favor of Cleric C3. Healing output would increase more by just taking Cleric C2 than Priest C3 (but Priest has more going for it than just heals).
Aukuras 15 reduces time between hp recovery ticks by 75% (5s). Enemy accuracy reduced 58%. Again the healing just is not very practical given how much people move around the map.[/details]
. Cleric C3, and Priest C3 have about the same heal output on paper.
You want more than to just put up health bars, you also want to prevent them from going down in the first place
A combo of Cleric and Priest (C2 Cleric, C3 Priest) is quite strong at healing and defense.