I heavily prefer OC's due to my ability to play with them as I chose however I am not afraid of playing canon characters you just have to understand you need to stay within their canon settings. Like Dick Greyson AKA Nightwing for example. You can't have him as some emo psychopathic homosexual mad man when in DC he is a smart mouthed, hopeful, and inspiring leader of heroes of his generation and regularly shows compassion for everyone to an extent. He even tried to safe Jason Todd in his darkest moments during the events of battle in the cowl where he offered a hand to Jason even after he claimed to have killed Tim Drake.