This is my experience climbing from Silver 5 to Platinum
These two champions are the best healers at this moment.
These healers are good, but not the best. (Both mobile so you can heal for a longer period of time)
Not main healers, but still great picks combined with one of the above 4. (As damage dealers)
Io is mobile but doesnt burst heal or heals multiple champions like the ones above.
Seris is not mobile with a long cooldown on her shadow step, so when people keep chasing her she is not that great.
Are these even healers??? If you think so then:
These "healers" are the worst. You might ask "why is Pip there?" - well he doesnt burst heal or have consistent healing (like Jenos).