after templar between those two
Warden.
Budding seeds is amazing now and great to throw out with orb an healing springs.
they provide a massive amount of buffs to the group, including:
-minor toughness
-minor endurance
-minor intellect
-major resolve
just as part of their healing / buffs
passive major mending, when you need it, its up.
the tree is a good cheap alternative to barrier
honestly if Warden could cleanse like templar could or didn't have such terribly clunky damage skills it might be considered the superior PvE healer. Templar just wins out on ease of use for the most part.
EDIT: also dealing with the corpse mechanic on something already as intensive as a healer is just annoying, I quickly quit playing my magicka necro as a healer as it was the most unfun class / spec experience I have ever had in ESO, I do still play both templar and warden healers in PvE and PvP and find them both enjoyable. this patch templar is on top though, with dots being so horrid the class that can deal with them the best = the best.