But there's so many other confounding factors (e.g. do billionaire men have more testosterone, as either a cause or an effect of their success, do they have children when they are older but the mothers are younger and so on) that it offers no evidence on its own.
In my experience, the primary consideration for most couples is the number of children. Then, if they want more than one, they want one of each. For whatever my personal experience is worth (mostly with middle and upper-middle class Coastal urban people).