Rr3= Realistic graphics and good physics, people mistake that fps in realtime eye vision also ensures a smoother experience while playing the game. Grid- cinematic graphics with good physics, but to be honest- doesn't worth the money that much which people spends on it- I could be wrong but if RR3 transitions towards utilizing vulkan a bit more than openGL, I can challenge that rr3 can squash Grid autosport beyond it's imagination, but it'll result 10gb+ file size for sure if it does.
