Hi John, 

You wrote: 

There are two versions of iTunes available. The newest one is the iTunes app you can download from Microsoft Store. You can still download the older one from the Apple homepage, that's right, but this version - at least as far as I know - will not developed further any more. So sooner or later you will be forced to change to the new app 

You've probably heard of Windows 10 S, the OS version allowing only installations of apps from Microsoft Store. In this article: 

you can read that Windows 10 S was leading Apple to develop the Microsoft Store version. By the way, the benefit of using the app from Microsoft Store is a clean install. If you install the old native app you will get services from Apple installed too, for example Bonjour. 

Because all of this I tried the Microsoft Store app first. 

Best wishes 

Udo