Your point is well taken and I appreciate expanding my knowledge on this a bit, but I don’t think that it is that cut and dry. Mach, the kernel from which both is not Unix. Mach is basis for XNU (X is not Unix, sound familiar). From the screenshots from Wikipedia, pretending that BSD is not embedded within MacOS is just trying to obfuscate things. The Mach virtual memory manager for instance is in FreeBSD, so it goes the other way around as well.
https://en.wikipedia.org/wiki/Mach_(kernel)?wprov=sfla1
https://en.wikipedia.org/wiki/Darwin_(operating_system)?wprov=sfla1
I would recommend Bazzite, Nobara or PopOS. Arch and its derivatives are also great, but they can be a bit technical. You do get access to the AUR though. I use Nobara, though.