In my opinion, men are more suited to handle investment and financial decisions than women. There may be some exceptions of women who possess extraordinary financial acumen but it's still a rarity. To back this up, if we peruse history, more men have succeeded with money than women. This is a huge factor that contributes to the wage gap.
History is a difficult one here to use, because historically, there has been repression. But, that repression doesn't happen now to anywhere near the same extent, so it is time to start actively learning.