Hydroxyapatite looks like it might be better, but regular fluoride can remineralize teeth too. Though how much fluoride remineralizes is quite dose dependent. I spent most of life rinsing my mouth out with water after brushing and only recently switched to simply spitting and leaving the toothpaste on my teeth, and I haven’t had a cavity since that switch.
Hydroxyapatite looks like it might be better, but regular fluoride can remineralize teeth too. Though how much fluoride remineralizes is quite dose dependent. I spent most of life rinsing my mouth out with water after brushing and only recently switched to simply spitting and leaving the toothpaste on my teeth, and I haven’t had a cavity since that switch.