I expected this to be a closer race, but well, there it is.
Love or hate em, they're almost certainly the two most iconic and influential WRPGs of the past decade.
The end of the 2020s we may well be having similar debates over Elder Scrolls 6 vs Witcher 4, lulz. (Oh who am I kidding, Elder Scrolls 6 is clearly coming in the 2030s for PS7 and Xbox Zero)