I suppose I just don't have the time to jailbreak / flash new OS on either Android or iOS anymore. I used to enjoy this sort of thing, but now it seems such a chore to configure and reconfigure...rinse and repeat.
I switch from a Nexus 5 to the iPhone 6 Plus. The last iPhone I owned before that was a iPhone 3G. The iPhone does a few things really well that just work. The software is polished looking...not always polished functionally. The point releases in iOS 8 fixed that for the most part.
The huge drawback (and almost a deal breaker) for me was that you still cannot change the default applications. Some smaller odd issues. You can't simply download a file and use it as a ringtone. Really we still have this problem? Oh right Apple doesn't like people browsing for files. But you can browse for photos, music, files within other app walled gardens. You can sort through email, text message conversations and many other similar exercises that would be a similar effort as to saving an MP3 to a downloads folder and then being able to choose it as a ringtone. Before you say it, I'm not plugging on my iPhone to my PC/Mac to sync my ringtones like a cave man. [/rant over]
If these issues get resolved, it would be the perfect OS for me. As it stands now, I'm teetering back and forth between what may be the iPhone 6S plus and the LG G4. We'll see, FaceTime is the killer app for me, it just works and too many people in my family already have iPhone's for me to make them install hangouts. The last time I tried that between my wife and I it was consistently a horrible experience between a iPhone 5s and the Nexus 5.