Ignore my votes, I meant to vote Windows XP and Windows 7 as the best versions of Windows, and Windows 10 only as the worst version of Windows.
Anyway, the reason why I choose Windows XP and Windows 7 is because, they were simple to use, have a clean start menu, built-in Help content (unlike Windows 10's, which is mostly online), faster and snappier to use. and the file explorer for both OSes were much simpler. Vista was a bit complicated for me to use, and it looked like XP in most aspects, but just redesigned, while 7 is a complete redesign and rework.
I mainly prefer Windows 7 due to its new file explorer, start menu, and new taskbar features.