I cant see any difference between 4 rays to 32 rays tbh but performance definitely take a big hit. I will leave it at 16. Vrs is nice, i had those micro block artifacts and it was actually cause by vrs. It flip it between all 3 modes and was only able to fix it when I shut it off completely and turn it back on to quality.
I've gone with 8 just because Digital Foundry said that's what the Series X is using so I assume it must be a decent compromise between quality and performance.
Honestly, I don't think there's any way to make this game look bad, it's one of the best scaling games there is. Fantastic on base Xbox One through Series X and right upto a 3090.