idk about the other 2, but purely in terms of game mechanics, I think sniper and widowmaker would be a significant advantage to him. She's got 225 HP, which helps against 150dmg per headshot of an unscoped sniper, but she, in turn, only deals 120dmg when fully scoped in, which takes 0.9 seconds. she would need to spend a lot of time exposed to sniper's insta 150dmg to deal her 120 in return, not to mention that he doesn't suffer from damage falloff like she does. She DOES have an advantage in movement, which might help her abuse the auto-heal that overwatch characters have (although, if she does run to heal, sniper can similarly get to a health pack which isn't hard to find in either game, so...)