Opinion:
Mac
This is a joke? :) I see that all of those Android devices manufacturers learnt COMPLETELY NOTHING. Sorry but even when I’m not the Microsoft fan and I use Linux for everyday I would buy some Microsoft Lumia device because of its extremely strong support not only about system upgrade (forget about it on Android device! ) but especially about bug and security fixes. Let me remind you about WebView JavaScript security vulnerability on Android. Such serious issue and the only solution prepared by Google is: ‘Update to Lollipop or buy a new device if you can’t.’. Great solution, really!