I was going to give Stadia a try when Doom Eternal came out because I wanted to play it in 4K and only have a PS4. Backed out because of their announcement that it was not native 4k, as originally promised, but actually upscaling. Whether or not I would have known the difference is another story but the backtracking on something they had been so adamant about left a bad taste in my mouth.
I also don't like their subscription model, TCO is way too high compared to console. You pay monthly and you still pay full retail price for the games.
I wound up getting Doom for PS4 and it's awesome. The HDR makes it look fantastic.