As a previous long time user of Android and now a iPhone user, I can't think of any that come to mind.
iPhone users tend to think their phones are far superior, but the truth is that you can get similar spec'd Android phones but at a fraction of the cost (LG G4). And the OS is much more customisable, and in a lot of ways better.
Nevertheless, the iPhone is a very good phone - its just that you are forced to buy the most expensive phones on the market (that don't even have a front LED), whereas Android manufacturers provide affordable versions too. But if you are prepared to pay top dollar, the best phone available on the market is an Android. The mobile world has changed, Apple has been slow to respond.