What os are you using?

MacOSX High Sierra, and Windows 10. I switched to Mac several years ago but still have my Windows machine.

using windows 10, i think is very fast compared to w7

Suse 42.2 or some variation with KDE and a lot custom build software on a 10 year old acer laptop, the thing runs like new. Only thing thats bugging me is Systemd

Just normal windows 10 works fine and i havent had any errors or issues with it i have a mac too

I use Windows 10 Pro, my first Windows were Vista.

I use actively Windows 10 Pro, Windows 10 Home, Ubuntu 16.04 (Desktop & Server), Ubuntu 18.04 (Desktop), Kali Linux 2018.2
Also to the list of more rarely ones Windows Server 2012, Windows Server 2016, Debian and CentOS
My favourite would definitely have to be Ubuntu 18.04 so far...

(Why so many? I have multiple servers)

debian 9 and windows 7, debian on server, windows 7 on client

Windows 10
Looks like windows 7 but much more modern which is what i like the most about it

I used Windows 10 it's fantastic I like how it works especially 1803 build group

Windows 10 Pro for my personal computers
Windows Server 2016 for my Home Server
VMware ESXi for my VM server