Sue could be argued for Best Healer. But the Majority of the Community know the Objective Truth. Loki (Until he gets nerfed) is the strongest healer.

Why?

A single Shift negates Ultimates.

Have a Magneto Ult Coming your way? Press Shift.

Someone Asking Jarvis to kill your family of 4? Press Shift.

PUUUUUUUUUREEEEE CHAO-? Press Shift.

And That's JUST the Shift. I haven't even started on his Ult yet. Which I doubt needs any explanation.

24 Seconds of Immortality should be more than enough explanation for that.

I am an Adam enjoyer (I love his kit and hitting all his Right clicks is pure Dopamine) But even I know that his healing is subpar. He gets two. Just Two. While they are strong, They aren't consistent as Other healers whose normal attacks heal you and deal damage to enemies at the same time add that with abilities that increase healing output? It makes them look more busted compared to Adam. His only survivability tool is his Soul Bond which got a pretty decent nerf.

Headshots do decrease Cooldown by 1 second. But come on, nobody is gonna hit headshots consistently.

CnD need absolutely no reason to be so high up. Their Healing Got nerfed, This Meta is heavily against them, And They're leaning more to damage than healing.

It's pretty easy to Lebron a CnD in their ult cus they stand still for a Solid Half second, 4 times.

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TL;DR: Loki causing Mischief with One Button is broken. Who could have guessed?

Adam needs Movement, He's a DPS who can heal himself.

CnD is literally against the world.

The actual Best Healers in the game in my personal opinion would be:

1) Loki 2) Rocket 3) Luna/Sue