For the sake of security updates it's best to go with 10, as mentioned before 7 will be EOL, followed by 8 and 8.1 later. 10 will be constantly updated as well so it will have the latest APIs when avaliable (DX13 and beyond).
I really want Vulkan to be on top, but honestly DX12 seems to have a lot more marketing at the moment. Guess that shows you how much power Microsoft has with game developers.
I really want Vulkan to be on top, but honestly DX12 seems to have a lot more marketing at the moment. Guess that shows you how much power Microsoft has with game developers.