Is there a difference between micraft windows 10 beta and minecraft in the mojang website?

So i was looking at the windows 10 appstore and i saw a minecraft windows 10 beta. Is it somehow different to the minecraft sold at the mojang website because it seems to be cheaper.

Minecraft W10 Beta is basically a mobile version of Minecraft for your computer. In my opinion it is a waste to buy/download.

Windows 10 Version uses c++ instead of java. Means your performance is much better on the Windows 10 Version. The downside is you can't mod it.