Windows is for gaming, GNU/Linux for everything else. I rarely play games, so most of my time I use GNU/Linux. I'm not very advanced admin, but I know how to use Google. My current distribution is Antergos.
I really like Python and I've created some programs to make my IT life easier. 😃
Android is my love, but love without root privileges is not interesting. Custom ROM is something, what is necessary for my life, because I love experimenting.