First I did it for privacy and to embrace free software.
However overtime I started to notice how much of a bloat Windows really was and my laptop runs a lot better, although I still have Windows installed because certain applications I need do not run on Linux or a virtualized Windows container unfortunately. I have also started to notice how much Windows tries to force you to use their Microsoft products like Edge Cortana and whatnot and force you into making a Microsoft account now, I mean shit I have a local account setup and one time when I was booting into Windows it asked me to create a Microsoft account, but luckily there was an option to just say no I want to keep using my local account. Outrageous.