You can only play games that you already own on geforcenow, you dont get access to any "free" games. You can play steam games, origin, even some gamepass games(as long as you have a pc gamepass subscription). But again, the game selection is limited. It used to be unlimited but then the game publishers complained so now only approved games are available(1600 or so games).

The xbox cloud gaming is shit in comparison. First of all, it runs on xbox consoles, so you need to use a controller, cant use mouse and keyboard. Secondly, the latency and overall tech is at least a generation behind geforcenow. Then again, you get what you pay for. Xbox cloud is an extra 5€, geforcenow can be 20€ a month. Geforcenow has convinced me that cloud gaming is the future, it's that good. Xbox cloud is "eh, ok, kinda cool that it kinda works". I am somewhat playing starfield on the xbox cloud and it aint terrible.

I think i will buy cyberpunk and its expansion to play them on geforcenow. Honestly, if i could play all games on geforcenow, i dont think i would buy a new gpu. With cloud gaming, you not only not have to pay for the hardware, you also dont have to pay for the electricity, since you are only running a videostream on your end, which uses very little power and can be run on almost anything. Though when i tried gaming on my lg oled's browser, it wasnt great, lots of issues, though it technically worked. Maybe it was some bluetooth fuckiness.