>>713322530Girls carry a certain connotation of innocence so it's kind of an easier sell. Also daddy's girl is not just a meme.
Now curiously Dad of War tried that shit and unsurprisingly it went to hell because boys are rowdy, obnoxious and prone to doing stupid things. It's much easier to sell the picture of parenthood with a girl than with a boy since the male player character has to be masculine. Whereas with a boy you need good writing too.