You will be happy with win ten, plus build 10159 just hit today for that fast build group. And dx12 is very nice, it runs a lot better even for things that are dx11 and below. You can sign up for early access for dx12.
Btw, I have hardly any problems with Windows 10, and I have been using since it was first avail to us, and when I update I copy the install.esd and make an iso to make my usb installer and do a fresh install every build. Best least problematic way to do it 
I can help with that if anybody needs a hand.