Another reason to favor the female of a species for an extended space mission involving possible settlement(s) is the total waste of resources to ship a living male for reproductive purposes.
Literally millions of diverse fathers can be shipped in much smaller containers requiring minimal upkeep.
You can do the same with eggs. Your breeding capacity is going to be limited by the resources available, then the wombs (real or artificial) available, then the care takers available, and lastly the sperm/eggs available. You're arguing for shipping more women than men in order to support breeding, but you've got to deal with the massive amounts of supplies to send for X people + breeding before you deal with the gender ration of X.