Windows or Android?

[black hawk]

I hope this is the right section for posting this. Now, I do not follow mobile phones much, infact very less. Up untill now I just used a simple Java based phone that served the basic needs. Now, I am in need for a new phone, since it is pretty much losing life, and I am seeing phones based on Android and Windows 8.1 mobile, which interest me. I want to just know in brief, as in major points, about the difference between the two and the suitability factor. All I know is that since Windows has recently jumped into smartphone business, the app store is relatively shallow. However, I was impressed by the Office applications that are preloaded, some Xbox app, and it's overall lookout (plus the presence of Cortana from Halo).
Also, I am not in much favour of mobile gaming, still if all hell breaks loose, and I am forced to think of it as my last resort, which one would be better?