Android. 
Because the Google Play store has far more free apps than Windows phone.
It should be understood that the difference between Android than Windows, first of all, that the first from the beginning designed as a mobile platform, while Microsoft product still is an adapted version of the desktop operating system.Because the Google Play store has far more free apps than Windows phone.
You are right. Windows best for pc and android for mobiles . Well when we are talking about resources in windows phone we could say that it only have few unlike android we could download what ever we want. The thing is their are more apps in android than windows phone thats why they prefer android over windows.