If you want security and a bit of privacy... iOS.
If you want the freedom to sideload apps — and expose yourself to malware — Android.

There’s more crypto apps on Android than on iOS. Many of those sideloaded apps which are in “beta” they don’t want to submit to the play store yet.

I don’t install many crypto apps. Security is a HUGE thing for me, even more so when it comes to wallets. Any app which matters, and can be considered safe slash “trusted”, is present on both platforms.