Going with the original topic it has to be Ewok Elder. He has a heal that also clears all debuffs, and a solid revive, unlike Daka where RNG comes into play. His basic also grants himself 50% TM and other allies 10%. With his solid 122 speed and the TM gain, he's moving pretty fast which allows him to heal allies more often than other healers in the game.
Ewok Elder like others have said is a long one to farm, but he is available in guild shipments, so that helps mitigate the time a little. But he's super easy to gear, so I think it balances out.