If it's Stock vs iOS, do you really care about privacy? Google is a data mining ad company, that's why their stuff is free. "If you're no paying for the product, you are the product". So Apple right? LOL no. Paying is no protection against being sold too. It's closed, you're never know, so they might as well make more money from you.
The only way is having any confidence in things is open source.
So I don't think iOS vs Stock matters. Android is more open, but all those root level closed Google services completely compromise the phone. They owned the phone.
What on earth are you guys doing having to search the internet for drivers for Linux??? You not buy things that have Linux support advertised? Not looking for good reviews by other Linux users?