You do realize that for Sony PC is still a side project right? Where they dump their old games once it reaches the bargain bin on PS. For example - Days Gone reaches 500 Rs on PS - they sold it for 3000 Rs on PC 3 years down the line. It's why Games like God of War Ragnarok or Horizon Forbidden West etc. are still not available on PC. MS meanwhile has exclusives on PC that they don't have on Xbox (Age of Empires etc.), release every game on PC Day 1 etc. They also have more MP focused games. You really can't compare between the two of them directly.
If you are going to retro-actively add old Bethesda games like Skyrim, ESO etc., then we'll have to consider Bungie as a Sony studio too (Destiny 2 as a complete Sony game then).
Bottom line - you can't compare like this on PC, since markets are comletely different. Just like you don't compare Nintendo games with Sony/MS as a traditional AAA games (High Graphics fare).