Personal anecdote: I broke my iPhone and have been using Android for a bit, and I must admit: at first I thought I'd switch back but nowadays Android is pretty good.
Hardware at a comparable price-point is solid, the UI is smooth and better-looking than it was before, the app ecosystem isn't quite as good, but is very very close, and there's features I would actually miss on iOS (a calendar widget on my homescreen, unlocking my device without touching the screen and Google's Night Sight).
I miss my to do app and my email app, both of which are not on Android (Things and Spark). But overall, I personally can't think of a single aspect where iOS "miles ahead" anymore, from an end-user perspective.