Hell, I don't know! I have no girls, I love my boys(ages13 and two) and I gotta say, when you have a boy going through puberty and has meltdowns as bad as an overdramtatic female PLUS the tantrums of autonomy from the tot feeding off of each other....I actually texted my husband at work " UGH! I CANNOT RAISE THESE GIRLS BY MYSELF!" i like the rowdiness and sweetness mixed with both boys....but at least early on...girls kinda want to please thier mothers a bit. Boys are more interested in thier own thing from the moment they become mobile!
I'd say both genders have pros and cons....but if you had seen me in the kitchen this evening holding a thirty plus lb tot on one hip in tears and holding my teen against me with my other arm crying and snotting....watching tot pet big bro on the head, you'd go for girls!.....and less space between children!