Who do think is the best healer?
Life cleric 1/ land druid xyz or life cleric 1/lore bard 6+
Who do think is the best healer?
You missed Lore Bard on the Survey. Although not as good as the Life Cleric (the amount of Healing one those puts out can be ridiculous), getting the Magic Secrets at lvl 6 and taking Aura of Vitality, and Prayer of Healing really throws out a lot of Healing.
Prayer of Healing always seems a little underrated in write ups. It's a second level spell that almost returns the game to 4E 10 minute short rest.
A multiclassed Sorcerer 3/Life Cleric 1/Lore Bard 6 can heal over 2000 HP per long rest at 10th level with Extended Aura of Vitality. No one else even comes close, although you don't really need to come close because that much healing is ludicrous overkill.