I have a Playstation 4 Pro and Stadia.
Since we stream almost exclusively at home, Netflix, etc., I almost don't get to use Stadia with my CCU. That's why I mostly play on my PS4 Pro. Unfortunately I also have no way to compare the image quality of both platforms, for sure the loading times on Stadia are much better and some games run with a higher frame rate but what is the pure image quality?
For example, would you rather play games like AC Odyssey or RDR2 on the PS4 Pro or Stadia?
If RDR2 support cross save, I will most definitely buy it again on Stadia and play it there. That game is like 100+ GB on PS4 and I don't have storage space for it anymore. Unfortunately it doesn't support cross save and after 40+ hours on PS4 I don't have the heart to start again.