Did not vote because at least two class is needed for majority of the groups.

I believe Nightblade and Warden combo is most safest for raids. Which is most preferred for me.

Some groups drop Nightblade and use Arcanist for shields and buffs that they can provide, but it is not worth in some cases in my opinion because in some raids majority of the damage taken is oblivion damage which goes through shields.

For other contents it is rather same but full scale groups in Cyrodiil probably runs five or four healers which have different classes and provides different things to the group. I suspect a Sorcerer healer or support for negates and easy Minor Recovery bonuses through Regenerative Ward skill. High health Arcanist for Gibbering Shield and Chakram Shields. Maybe Necromancer healer for synergies since class has access to two strong synergy. Nightblade healer can also run ultimate regen sets to spam barriers but not sure how it will be effective with Battle Spirit modifiers. I would prefer all of these classes present in a full scale group because of these reasons. Once all of these things are combined you are basically immortal.

I use NB 'cause it's my main and I'm too lazy to switch. Though all my chars can play any role, but there is no point.

I've healed for groups with all the different classes and my Templars turn out being the best healers.

So, I understand the poll as: I am a DPS and what class do I want to heal me, right?

Warden is best, because of the armor buffs are always taking away a skill slot. The 10% health and 15% recovery make it even better.

Second would be Arcanist for me, now that I have gotten used to the beam.

And I hate Sorcerer healers because of the birds.

Major resolve + minor toughness + minor vulnerability + budding seeds synergy + can heal at range.