What OS do you use on your pc and why?
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Windows 10 on my desktop. I game and work on it, and there are applications for my job that I can't get to work on Linux (even on Wine).
My laptop is on Linux (Endeavour OS). It's my portable device and I don't use it for work so Linux, imho, is my best choice. It's pretty old as well.
What applications?
The major one is a CRM application. I'm not sure but I think it's an internal app since I've tried searching how to make it work on Arch but never found one.