I am one of these people who use both platforms and have bought jut about every flagship android device in 2015 including the Note 5, but it's pretty obvious why iPhones rank among the best and it's not about features or being able to use nova and skin your home page layout with custom icons and widgets, it's actually a very simple set of reasons.
- Quality build
- Great screen, sure it's not the note 5s but it's damn good even non amoled, it's sharp vibrant and gets crazy bright in the sun.
- Battery, while the note 5 is a bit of the exception when it comes to android phones, the batteries are usually suspect at best. iPhone plus models have generally given best in class performance and stand bye time is a non issue like android.
- iMessage, this is not so easily dismissed when 80% of every one you know uses it, and no, SMS can not compete especially when you factor in things like answering calls or text messages on laptops, desktops or iPads, plus the ability to easily send full resolution video and images.
- iOS, sure it's boring, yea it can't be customized and every one who owns an iPhone looks the same, but I don't think it's as important as we make it out to be for every one, the over all software quality, fluidity of the experience and general performance optimizations of the platform outweigh the ability to use an icon pack for many.
There is clearly more but I think this is probably what drives most people to the platform versus android alternatives.
Plus you have to admit, the fragmentation of android and every carrier and oem screwing with builds to make it their own is just obnoxious and hurts the end consumer in terms of devise upgrades.
Cheers