If your GPU supports vulkan then vulkan it is, if not, then opengl, examples of opengl usage is older cards or/and nouveau driver, not nvk, and they work on backporting nvk to older cards too so even older Nvidia cards gonna support Vulcan one day, so, use Vulcan if supported
I’m likely to switch to Linux soon and I’m definitely struggling with this choice :/
If your GPU supports vulkan then vulkan it is, if not, then opengl, examples of opengl usage is older cards or/and nouveau driver, not nvk, and they work on backporting nvk to older cards too so even older Nvidia cards gonna support Vulcan one day, so, use Vulcan if supported