Windows 7 and 10 for me (dual boot). Macs are PCs though.
Self-built computer with decent graphics card. Would rather have the 1080Ti. Even though my current dual major is Digital Media - Web Design & Digital Publishing, I highly prefer Windows since I’m more familiar with the shortcuts and have been using the operating system for far longer. Plus side is since I have a 970 FTW I can have the Adobe programs, CC 2015 and CC 2017, strictly use the VRAM from it. Not just for games, re-encoding stuff, and making Blu-rays on my machine.
Except I want to build another computer. I tend to stay with AMD since I’m more familiar with them and nVidia for graphics cards. Majority of everything else is ASUS.