What Operating System do you use?

Win7 and Ubuntu.
and many raspbians for my little pets

Raised on a PC, Amstrad 86. Then x86. Then Pentiums. Then moved over OS X. Circa 2005.

Windows 10 on my laptop, and macOS Sierra on iMac, Sierra is getting slower and slower with each update,

windows 7 pro but miss xp

win10E + osx + centos

7 at work
10 at home

Ubuntu and Win7 on a split partition

Windows 10. But I want to try Ubunt someday.

Microsoft Windows 10

Windows 10