Due to the optimizations Windows 8.1 is my favorite Windows version. When I compared it to Linux Mint 21 Cinnamon on my old (now dead) laptop, it performed slightly faster. It also somehow beat Windows XP which is what that thing was made for. Although a part of that could have been that half of the drivers only worked in XP, so it had more to load.
Maybe if they properly called it Windows 9, it would have caught on. It was definitely different enough from 8.