Well, even within the "mare" group each one is so different. My mare has never been what is described as mare-ish. She was slow to give affection to me ( I call it going soft, just a certain look in her eyes and "hugging" me with her head/neck), and I certainly had to earn her trust and respect. She was never stupid though, and was careful to keep herself safe as well as me or whoever was on her. I will say though, T as many mares will, give you their opinions about what you're asking. They seem to be "thinking" about what's going on, instead of just obeying without thought.
Walka, my gelding, well he's just "special" LOL! He is very much a one person horse, and I am that person. This is not something I want to encourage further. I don't think it is helpful to him. But, he does trust me to a fault and wants to please me so much. If he does offer his "opinion", a simple growl from me and the poor boy almost has a heart attack!
I don't look at horses according to their gender. I go by the "energy" they put out and the sense they show or don't show.
I have ridden and worked with many horses, mares , geldings and a few stallions, but I have trained only a few youngsters. I do know that I am complemented often for the calm, quiet nature of my horses. Someone always wants to "tuck in" to mine when on a ride.
Looking forward to reading what others more experienced have to say on this subject.
Be the kind of woman that when your feet hit the floor each morning the devil says, "Oh crap, she's up!".