I used to use Android OS phones. I’m comfortable with my iPhone.
As far as Apple’s Calendar vs. Google Calendar, Apple’s Calendar is not a factor. I just use my Google Calendar app as my default calendar. On the odd occasion that I need a reminder that is not available in the App, I go to the Google Calendar website which I have bookmarked in the DuckDuckGo app on my iPad. After I set the reminder in website, it quickly syncs into the app. This only comes up when I want a reminder to occur simultaneously with an earlier event’s reminder whose time is not conducive to what is available in the app. I will almost always set multiple reminders to help me remember.
4G