The former will never admit regret, to "save face". They will tell others at least they have freedom.

People without children are miserable when they get old.
My superior is a childless and unmarried man. He is so free that he even works on weekends and kacau us, all my colleagues who are married all share the same ill feeling towards him. We all agree that these unmarried middle aged people are miserable and immatured, despite their age.

No offense, but what I have seen so far among my friends with daughters, all 8 of these couples, the husbands are afraid or should I put it in a more polite way "respectful" of their wives.
As for other couples where the husbands are not as respectful of their wives (myself included), somehow tend to have sons instead.

I would also love to know how to conceive a daughter, if you have anything to share.

At least her life appears more interesting that way, but is she truly happy? Only she herself can tell. I personally can't imagine travelling by myself, it's just so boring. But whatever floats one's boat I guess.