The thing is, there are advantages to both. A Stacy is going to produce better offspring but that is assuming that she'll be willing to bear the fruits of your groin.
Interestingly enough, regardless if she's more fertile or not you'll probably impregnate the Stacy much sooner as men ejaculate much higher doses and higher quality doses of sperm inside of a Stacy and the quality of orgasms are out of this world, while with a Becky they're meh.
So being with the Stacy would have a lot of advantages both for you and for your future offspring. You'd have the best sex of your life and your son is a potential Chad or Chadlite is he looks like his mother.
Then why the Becky (just how I call all Sub-Stacylite toilets)? Well, sure a lot of men married to them prefer to watch a Stacy livestream on Twitch to having sex with their actual wife. She's probably not good in bed, she probably won't ever let you experience the best orgasms of your life, she will probably not even have that much sex with you as toilets who perceive themselves as uglier see themselves as "less sexual" unless they are sleeping with a lot of men at the same time casually, in actual relationships ugly toilets have less sex (so Becky's have higher body counts but lower amounts of sex overall).
Your sons are all probably going to be incels and your daughters sluts.
So why did I choose the loyal Becky?
Very simple, you'd have companionship for the rest of your life. After Stacy leaves you you'll have a life of Inceldom, if Becky wants to be yours forever and loves you then does it really matter if your orgasms aren't out of this world? The biggest argument against this is that it will fuck up your children and that's the biggest reason why I am not 100% behind my decision to choose Becky, but I'd love her like she's the only toilet in the world and I'd happily wake up next to her ugly face and kiss her good morning and good night. I'd love her if she loves me.