It runs a lot better (streaming quality, glitches, start-up times) are incredible. Using Stadia in general is a polished (yet basic) experience. In contrast Nvidia very much felt like a hack. Log-in in my steam account, seeing weird window glitches.
I see a lot of comments negative on stadia here,based on bias rather then actual experience. Stadia is nothing short of tech star even with its downsides compare to the rest of the market.
Some of these titles I've played multiplayer via Steam without any of the related issues, granted Steam/Stadia is an apples/oranges comparison.
At the end I suggested we try Armagetron. 2.7MB download and runs on Mac/Win/Linux/Potatoes. I started up a private server and we were running a 16-player game without any issues in literally 5 minutes.