The argument of Apple having a better UX is also a classic that I've heard a lot.

I'd accept the preference of familiarity, as perhaps iphone users are just used to using iphones for a long time. However, for people who don't program computers or phones and only use either as a Facebook machine, they probably couldn't really point out what the difference is; other than the inconsequential simple things, such as: "on this phone, you go to this menu to change the wallpaper, which is a different menu on the other phone".

Idk about the other thing, I've just plain never heard of people needing to debug their apps on Android during casual use.