Useful good apps
I really like the I integration people provided on Windows phone. But it was conceptually different that I can imagine some would have difficulties to understand. And then there was the total lack of official banking and public transport apps. And it became hard to justify using it. And I haven't even talked value things like Apple Pay on the underground and uber etc.
I much preferred the UI, also liked iCloud support, well caldav and cardav, out of the box. But the lack of good useful apps made me stop using my Nokia 930.