I have seen both used. They are both good in different ways. A few things.

1. Bless (+warcaster) is a clerics MVP.
2. Cleric damage sucks outside spike damage with spells (guiding bolt, spiritual guardians, domain spells etc). The exception to this is the war cleric.
3. Healing in combat is generally a waste of time. The exception to this is the life cleric.

The life cleric seems to burn through spells a bit faster than the other clerics I have seen (war, tempest, light). THats because they actually heal people + try and cast bless and the odd battle spell from what I have seen.

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