More important than any hardware concerns when shopping for a new smartphone is establishing which OS is right for you.
It is better to use Windows in computer but for mobile it is just hell to use Windows OS in compared to android . Android OS is more preferable for the customers because in less power full phones it performs better for its light OS and less hangs. If come to availability of apps, in Windows there are 20% of apps available in Windows store compared to android.I f you have interest in games you should not go for Windows phones because most of the big games are launched in android.
But androids has a poor reputation in the field of security.
In a word I can just say, it is better to buy android compared to Windows.