iOS, to me, feels like a predictable OS. And that's what I want with my DD. It doesn't have to be exciting, it has to be reliable/fast/etcetera.
I feel like Android is all this plus customization and extra features.
I honestly don't feel iOS is as predicable as it should be. The random security measures that sometimes calls up pin code or password requirements when I want to download something. Or when the stock keyboard comes up instead of the third party one I set as default. The back button isn't always in the same place (upper left, upper right, center, bottom left, etc). To unlock my iPhone, randomly I'll have to punch in my pin code instead of my usual finger print. Or sometimes settings are in the main Settings menu, sometimes it's in the actual app itself.
These aren't nitpicking examples. This is everyday usage and navigating around the OS.
Not trying to deny iOS is right for you, of course; I just wish I found it as predictable as you did.