I don't know much about competitive pinball or statistics but a quick check of the IFPA website shows that there are 30 392 players registered in the rankings and 2131 are women. By my calculations, that is about 7%. So if you are asking why there are no women represented in the IFPA top 25, I suspect that's your answer right there. As for the answer to the question in your title, I don't think it is clear that men are better than women at pinball (all things being equal) and I don't even know how you would work that out but I'm pretty sure that a cursory glance at the rankings is not going to give you the answer.