I used Nvidia GeForce now for some months and must admit that I can't feel a difference most of the time. I tried call of duty warzone and even this was great multiplayer experience. (Game is a mess with GeForce now, can't remember shader cache and must recreate it every GeForce now session)
You don't feel the difference until you play without the lag.
I've got something like 1400 hours in HellDivers 2, playing Level 10 I don't want to experience any lag. I recently changed the configuration of my machine and I've able improve framerates/frame pacing and it make a lot of difference when playing the game i.e. some melee counters I can much more easily perform.