Hello and welcome.
I'm using iPhone and Android phone regularly, so I can share few details:
- What I miss the most in iPhone is the customizability available in Android. moving the icons in desired position, making the middle screen your default home screen - small things that matter.
- the basic functionality is almost the same - making phone calls, notifications/control center so you won't have problems getting used to Android
- the most important thing to check before making a switch is if all important apps that you use daily are available on Android. Few apps that I regularly use on Android were not available on iPhone, as well the quality of some was better on Android.