I moved from a larger Android (Samsung Galaxy S9+) to the 12 mini and I love being able to one hand my phone very easily and have something that's so easy to pocket. My partner has the 13 regular and it's size isn't bad but the iOS UI is just wholly unintuitive for one handeduse.

After 22 months with the mini, I am considering upgrading to the 15 Pro when it comes out, not because of size but because of the improvements in the camera tech.