I had jury duty once…
They’re all good…it’s one of the beautiful things about the game mode….everybody works….but I do think there’s a heirarchy of importance/priority….I mention it here…so going by that I’d say mercy is the best….followed by moira
Dupes are the only issue the game mode has and getting rid of that will help immensely with team composition and the ult charge “issues”
If you really want a in depth explanation why you can go here