Impossible for me to answer easily. As a little kid, I would have chosen cisgender male, no question. I was a complete tomboy, and I didn't fully understand or quite believe that I was going to turn into a real girl.
As a teenager, I likely would have chosen cisgender female, just because of my female body and because I was so down on myself that I thought I was a sicko perv who probably didn't deserve to live. Despite my weird fantasy life, which I kept carefully compartmentalized from everything else, I thought at that time that I was a girl. And it would have been wonderful to feel comfortable with that sex and gender.
However, I've never been fully comfortable with my sex and gender.
If you ask me now? I don't think I could have done anything other than what I'm doing, but it would have been so great to grow up and live life without all of this turmoil and strife. Yet I am what I am. So I guess my fully informed response would be that I wouldn't change anything. But that still isn't a fully satisfactory answer.
Ask me again in a year.