The only thing I always admired in iPhones was the screen (both the image quality and the touchscreen precision and the "feel"). But after using Androids that cost the same (and recently, even half) I can't say that anymore.
And I never understood how can the iPhone not have a default back button. Every app has its back button placed somewhere different in the screen, which annoys me sooo much (but I know that I could get used to it in a few days). In android you have the physical/capacitive button on the bottom that works anywhere in the system and this is just perfect.
Whenever someone with iPhone would ask me to configure something for them I would go to the settings and get lost in there, while in Android it seems to be better organized, even with all the companies customizing it... But as a "pick up and use" the iOS has always been great - but ai can't say that the Android is not at the same level.
Now I have an OP3T and at first I didn't like the switch for silent/do not disturb/ring, but now I see that it's soooo good. And if I am not mistaken the iPhone has it as well (maybe with just two options?). Can't understand how the other android flagship s don't have it, it helps a lot to change sound profiles.