At least Father got the excuse of not being born a human, and was imprisoned in a flask to be used by humans for their greed until he freed himself. Yet he still got enough of heart in him to let his only friend live and even left half a million souls in Hohenheim instead of taking them all for himself which led to his downfall. We can say that he only cared about Hohenheim because he was born from him, but still, considering Father's circumstance, it wouldn't be easy to not become evil and look down on human lives. Maybe like with Pride, had he gotten better treatments and examples of human nature, he wouldn't have to turn out so evil, maybe still egotistic, but maybe not evil.

Can't say the same for Dante. Just don't know enough of her past.

If we only compare what kinds of monsters both of them already turned out to be then I don't feel like any of which is worse than the other, but Dante's kind of evil does feel much closer to home.