I have a 2019 tube and a 2019 Pro. Definitely go with the Pro. The tube complained of low system storage out of the box. I had to install an SD card to make it stop notifying me that storage was low. The pro seems to hang less than tube. Although the tube only really hung when using emulators or kodi.
Get the shield controller as well. I used the pro with an Xbox one controller and it would randomly disconnect during gameplay but I didn’t have any problem with the shield controller.
If you have your PC and shield both hardwired, the streaming quality is flawless. I could never tell the difference between native and streamed performance.