The irony you fail to realize, the differences listed in fact would be typical of a random Unix system in the 80s, where it's just a mountain of bad and random opinions stapled on top of a Unix system. Some random and half-baked libc? You got it! Some bizarre and overly convoluted greenfield filesystem structure? It's right there! Completely different and frustrating custom linker behavior? Yep!

Everything I listed was an advantage. Now see, I don't think Unix is the be-all end-all of operating systems design. I don't particularly care for Linux, the BSDs, macOS, etc. But Android is a definite regression in the strongest terms. Give me a PIMOS or Genera or Squeak phone that works well. I'll be happier than I would with a Linux phone.

Which system has better security from an end-user perspective?

Only iOS comes anywhere close.