I don’t know. If the comp has specific heroes or even players who like to be spread out and about, my go-to usually isn’t Moira unless specific conditions are met. A Mercy Guardian Angel to a player who needs healing is a lot better than a Moira Naruto running. And I’m not going to phase willy nilly. :c You learn very quickly that if you engage in combat to try and heal, it could definitely lead to some bad times.
Mercy and Moira are my top 2 and 3 most played respectively, so from my perspective, it just really depends.
But then again you know. I also play only QP.