Win 10 or 7

I've Read the sticky long ago which says win7 is a must for emulation but i'm still torn about this. I want to install a Windows OS purely for gaming, and since emulation is not going to be the only gaming i will be doing, i'm worried about lesser performance on modern pc games that can actually use dx12. Although this is a laptop with 520 intel graphics card, but still it supports dx12 and i dont how better this makes for normal games

http://www.tomshardware.co.uk/answer...s-windows.html