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It is a tricky question. Each have their advantages and disavantages.
For reference I have been diagnosed ADD, OCD, depression, and anxiety disorder (yes, I am a mental wreck of a human being, but it is what it is.)
One one hand I'd like end up with someone who has their own mental problems they are working through, because most people don't know what you are going through when you have a mental condition. Being with someone who is struggling with their own mental health means that the two of you kind of know what the other is going though and you can help each other out.
But on the other hand, being with someone who is mentally stable means you have a crutch for when shit hits the fan. You know you'll have someone to fall back on. Sure, they might not know what you're going through, but they'll be there to encourage you. And if you need to take a few days to get your bearing, then you have someone tho help support you.
In the end you won't exactly know what a person's mental health is like until you've been together. Last I checked "Are you mentally stable" isn't the best pick-up line. However, I have found my mental state to actually drive me away from people, because I don't want to burden anyone with my mental health problem. I feel as though it is my burden that I should shoulder alone.
I would be wary since a lot of women aren't tolerate of men with mental health issues as dating material and I don't want to accidentally hurt someone I love. But if she is open and willing to listen and give me encouragement for me to combat such mental issues then I don't see why not.