I've been after a small, powerful phone with great camera for a while, and recently sold my Nexus 6 and got an iPhone SE. I was pleasantly surprised to see improvements in iOS around inter-app cooperation--pressing a url in Gmail opens in Chrome for example and not Safari; LastPass can fill in passwords into Chrome without need to copy'n'paste, etc etc. I signed into Chrome, but didn't need to sign in and authenticate to the other Google apps--just selected 'use as Simon'.
I can't be bothered rooting/ROMing these days, or even messing around with 3rd party launchers, so for me the move to iOS was pretty painless--quite an enjoyable change even.