I don't know, if / when I do get married (I do intend to) It will be a fifty/fifty split. No kids or 1 kid. If one kid, then 50/50 for adopted or not. If my wife doesn't want to go through both pregnancy and childbirth, I won't make her. And there are many children in orphanages who would kill to have a proper family and go to school, why deprive them further?
But through my experience and that of the girls in my close social circle, only child is WAY better.