Apple iOS: Propably being spied by manufacturer, can be spied by NSA, can't do anything to improve this.
Google Android: Know you're spied by Google, know you're spied by manufacturer, know you're spied by third-party, can be spied by NSA. But most of times you can cut them all (except NSA) off.
Recommending to move to ios from android isn't really good advice.
The choose is:
Apple iOS: Propably being spied by manufacturer, can be spied by NSA, can't do anything to improve this.
Google Android: Know you're spied by Google, know you're spied by manufacturer, know you're spied by third-party, can be spied by NSA. But most of times you can cut them all (except NSA) off.
I’m no expert, but that sounds about right, unless you de-Google your Android, which I have no experience with, never having used Android myself.