My first few tablets were Android based but once I got a Windows tablet I no longer had any interest in Android tablets. I love being able to run full Windows programs such as Excel and Word on my tablet. There are a few Android apps I like and use and for those, I have my Android phone.
IMO, a Windows tablet beats and Android tablet by a wide margin.
I have the Surface Pro 3 which many people state is an expensive tablet, however, it really competes in the Ultrabook book category and, in that space, it's not expensive.