Apps and well the alternative to Android for me would be Plasma Mobile or something anyway. Many apps I use (Syncthing, Firefox, file manager, emulators) are forbidden or crippled by Apple policy.

While I have a work iPhone 12 so I use both iOS and Android daily, I do actually prefer the Android ecosystem, plus iOS being locked down in terms of installing third party apps is a disqualifier for my personal device. Also bugbears like the headphone jack, though I might be out of luck there in Android in another device rotation.