What is your operating system on Pc?

Linux. Anyone who says Windows is the best is not very smart.

Windows 10. Easy to use, allows me to do everything I need but still a big mainstream os with a ton of features. Some of the computing things I do requires me to use Linux, but that's not what I use the majority of the time.

I am still using Windows 7 ultimate service pack 1.
I dont want to change it.

I am using Windows 7 now. Was using Windows XP until Microsoft drop support for it.

I currently run Windows 10 and Mac OS. I don't know if I can move to linux i have gotten lazy.

if it is a pc, then windows 10th but rather macos :-)