Dumbledore is such a train wreck, and he recognizes it and tries to fix it and half the time the ”fixes” make things worse. Snape spends his whole life cursing the world for doing him wrong, and even though he recognizes that he has something to do with his own problems, he never really makes an effort to understand where he went wrong or try to change for the better. They’re both tragedies, and they’re both fascinating, but I agree that Dumbledore’s the better-developed character.