XCloud or Stadia?

[VAMatt]

It seems likely that we'll learn more about XCloud during the MS presentation at E3 in just a handful of hours.  So, I'd just like to see what everyone's thinking about XCloud vs. Stadia, from the perspective of a serious gamer.    

After the presentation tomorrow, we can use this thread to compare and contrast...unless that ends up happening in the MS E3 thread.