Having owned practically every Android phone made and all the Iphones, I now own a Nexus 5 android phone, but soon will be returning to my favourite phone of all the Nokia 930.
OK its not perfect, its not the lightest, its not the fastest and definitely not the most popular device out there.
With Windows phone I miss some of the top trending games, google apps and maps, I miss the Appstore and Playstore from Android and iOS, I constantly feel that Microsoft will announce at any moment they are dropping phone support (paranoid nonsense I know).
I miss the tinkering, customisation and ROM flashing of the Android world...
BUT the Windows Phone UI, is just perfect for how I use a phone, having once been a fanatical "Post it" note person, the Pin to start for practically everything is amazing and something that is completely unique, OK with Android you get widgets, which are basically just extensions of the app and Iphone you get the completely useless notification pull down. Also the speed getting from home screen to app on the WP is far nicer and beyond fluid in its integration, finding apps is so simple, swipe, select a letter, find the app, not swipe, swipe swipe back again, where did i put that app. Multi Tasking especially with the 930 works in a similar way to Iphone, yet with the a slight hint towards the usability of the Android system, which is very fast and efficient.
The People Hub on WP, far better than Blink feed on Androids HTC or any app created to bring together Twitter and FB, Ok its not as usable as it was when you could interact with FB posts, but its still so much better and incredibly fluid to use.
Of all the phones I've used outside in direct sunlight the Nokia 930 has to be the easiest to view the screen on, it almost seems to glow in bright sunlight, even my old S5 Samsung which was meant to be the best, didn't come close to the clarity of the Nokias 930 outside.
Dedicated Camera button, OK some of the Xperias and Android phones have these now, but with WP its always been there, the camera is great, but what makes it so much more interesting is the ability to install lens add-ons, which makes so much more sense than having a separate camera app.
Comparing battery life on phones is tricky as many of the latest Android phones have huge 3000mAh Plus which can last easily into two days use, but comparing like with like size ie the Nexus 5, I would say they are comparable if not the Nokia 930 lasting an hour or so longer, charging is definitely faster on the Nokia.
In fact the Nexus 5 is pretty much an identical spec with the same processor, ram, memory, screen size and battery size and of all the Android phones ive owned id say its the best most fluid experience that Android can give, but for me the Pin to start, addictive UI, People Hub and overall experience of the WP Nokia 930 stands out beyond anything Android or iPhone can give me.