Which android phone were you using and which iphone did you switch to? Asking because I'm very skeptical that iphone and android have any significant difference in daily usage speeds.
Maybe the total time to complete a given task is about the same, but I can seriously say I have never seen the iPhone drop a single frame. The Pixel got choppy all the time. Every Android phone owner knows the feeling of "why is my phone suddenly hot? Oh some runaway background service" or "why is this thing running at 5fps? Oh an app is auto-updating in the background".
iPhone just doesn't have these issues.
Personally I switched from an S10 to Iphone 11, and was absolutely repulsed by the horrible screen on the iphone. They both felt similar in terms of UI responsiveness. But due to the screen I went back to the S10.