I've been sticking to Vulkan in most of my playing sessions lately. It's fast and stable overall in my experience. I'll switch to Direct X11 when issues pop up, like a thick black bar on Resident Evil 4 Wii Edition. I've stopped using DirectX 12 because it doesn't support 3D, which I use a lot.
i5 9600K @ 3.7 GHz
16 GB DDR4
1 TB SSD
Nvidia RTX 2070
Windows 10 Pro 64-bit
16 GB DDR4
1 TB SSD
Nvidia RTX 2070
Windows 10 Pro 64-bit