Best Windows for gaming?

[GrowTFM]

I need to know.
I recently build a pc.
(It's not the pc listed in my signature)
But now it's lacking Windows.
I honestly don't care about DirectX 12, because i play a lot of "old" games, only sorta new game i play is Overwatch. Other games are from 2011 to 2014. So best performing Windows there is currently?

 

[Gingerbread]

If you will play games from that year - hands down Windows 7.

 

[Frag Maniac]

LOL, Dx12 isn't even very useful in the new games that use it. Vulkan is a far superior API. Plus W10 is by far the OS with the most snooping and bugs.

Stick with W7 until it's not supported anymore, which will be 2020.