I would tend to think that, for people truly on the fence, it is much better to not have kids and later regret it, than to have kids and regret that. At least with the former, you can still have an otherwise full life, and you're the only one who bears the brunt of your regret.
If you have kids and regret them, the kids are going to suffer for it, even if you do everything you can to hide that regret from them.