[@Mr Allen J]
At the moment, my favorites that I prefer playing are:

Offense: Pharah, Tracer, McCree
Defense: Bastion, Widowmaker
Tank: Reinhardt
Support: Mercy, Symmetra

I've been trying to practice with:
Offense: Genji, Reaper
Defense: Mei
Tank: Winston
Support: Ana

I will not play:
Offense: N/A
Defense: Spamzo, Junkrat
Tank: Roadhog
Support: N/A