>>272939856
Basically, the major differences are 
Rift S
>80 hz
>LCD screen, so less Screen Door Effect but less deep blacks
>comfortable halo strap
>no IPD adjustment

Oculus Quest
>72 hz
>OLED screen, deeper blacks but slightly worse SDE
>front heavy, might need some getting used to
>IPD adjustment
>needs Oculus 80$ cable to work well with PCVR
https://www.youtube.com/watch?v=nilhor5NT0g