Kotlin on Android is great, I think I prefer it over Swift. Android Studio frustrates me significantly more than XCode. Gradle frustrates me more than... whatever iOS uses for builds + CocoaPods. The Android Simulator frustrates me more than the iOS simulator. The Android BLE stack is a disaster; the iOS BLE stack is tolerable. Being able to hand out APKs is nice.

Edit: not being able to work on the iOS app while my MacBook is getting repaired after a coffee incident is pretty terrible. Android Studio works fine on my spare Linux laptop.