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If you are the kind of person that would be bothered by a lack of "instagram", "draw with friends" and other apps, go for Android. If you want a solid phone that just works, while offering good email, good battery life and a growing marketplace of applications and clear upgrade expectations, go for WP.
Android off-course as it has a huge collection of Apps in compared with Microsoft windows Mobile phones. Also, Android operating system is an old player in the market and offers much more features in comparison with Microsoft windows phones.
As well as my knowledge both are good but when we talk about some features than windows are better to security purpose but some apps are not install in windows like instagram but in android mobile easily install.