They are imo very different services and both have trial time.

Test them both and decide for yourself.

I personally prefer nvidias service because I actually play games in my steam library. Stadia has few games and you're always forced to use their services. No way to play locally even if you have decent hardware

Ok, so I buy Cyberpunk 2077 through Steam and then Nvidia NOW can stream it to me?

Exactly.

As of today, you can also buy on gog.com and stream from Geforce Now. Gog releases DRM-free versions of games, so that's worth supporting.

Ah, I got it through Steam as I already had a Steam account. Been playing around with HL2 and the input lag is there but not horrific. I probably wouldn't use this for multiplayer. Just need to source a gamepad of some description.

Both MBP and PS4 aren't capable enough to run it without serious problems (PS4) or at all (MBP).

Best solution is cloud streaming, geforce now seems more capable.