For healing, it's Moira for me. I do like Brigette, but I just can't get her to work as well as I'd like. My second DPS pick after Symmetra is Tracer, usually on something like Volskya Industries attack. So many people still don't realise you can get behind the defenders if you blink around the side. You CAN port there with Sym to be fair, but Tracer gives me a higher chance of survival when distracting everyone.