What is better to preserve - mental stability or creativity?

Tough question, and it would depend on how bad the mental unstable the person was. That is are they a danger to themselves or others? As long as they aren't a danger to themselves or others and the person doesn't want treatment, then they should be allowed their own creativity. Or as a manic depressive once put it as bad as my lows are, you can't imagine how high my highs are, and if she was happy with that who are we to disagree?