What has been yesterday does not interest anyone, what counts is today. Fact based on app store rates is users of iOS are more dissatisfied with the app than Android users.
Apple store rates : 2.9, 4.3K Ratings
Google store rates: 3.1, 42,1K Ratings
Second fact DJI has chosen Android as the operating system for their new SmartController. So DJI and most DJI pilots on world seems to prefer Android. It is a myth long past that iOS is better or more stable. You can accept or deny these facts.
DJI chose Android for the controller because there is no licensing fee for open source software. They would have preferred iOS but didn't want to pay for it. They chose it because it was cheap.