Scrims, and PUGs are perfect for testing out those heroes, and on top of that, scrims and PUGS tend to play better and feel better than comp. They’re not hard to join either tho, theres multiple discord servers, custom games, and even sites for just find scrims/PUGS. Mystery heroes is the worst place tho, because it makes surviving the main concern compared to playing as a team. In comp, you may have to die for your team to win a fight, instead of running away. In this mode, this encourages you to run away when you’re on a hero you’re good at or want to play.