Is there an official developers phone for windows mobile like the nexus for android?
I have recently ported to Windows 8 and Android from iOS (Windows Phone 8 would be very similar Windows 8).
Personally I find the Windows environment to be far superior from a development point of view. The liberal use of bindings means that most of your front end is purely xml, and there is little time consuming and error prone manual linking up of the widgets. Even better than that though is the speed of testing. For a Windows 8 app you can make a code change and deploy it, an you are testing your change 3 or 4 seconds later.
With Android, you make a code change, deploy it, go and make a cup of tea, then when you have finished drinking it, the app is (maybe) ready to test. When you spend a lot of time fiddling around and making things just so, then this can eat up many many frustrating hours.
Then again, windows has a much much smaller user base and users don't seem overly keen on paying. Shame really...