When my iPhone was on its last legs my son convinced me to go with an android phone. While it is ok, I found the operating system to be a bit quirky in that it sometimes just didn’t do what it was supposed to do. It is hard to describe, but it just doesn’t work as expected all the time.
Not so with iOS. I never had a problem with the iphone other than it was very old, and have never had a problem with my iPad. It always works exactly as expected.
The downside is you can’t add memory, and apps are sometimes more limited. When my quirky android gives up the ghost, I’m definitely going back to an iPhone.