Hi Wicky,
Well the first one does sound like she could help with your specific breast cancer recovery thing, and I certainly wouldn't want to talk about that with a man either! Actually if it were me I wouldn't even be interviewing male ts. It was a very easy choice when the intake coordinator at the mental health center I'm starting out said that all the female staff ts are full, do I want a male staff t or a female intern? I went with female intern without even having to think about it!
But a man might be good for you, since you seem much more comfortable with men. I'd also call a few more if you can to give yourself as many choices as possible.