Metal/roughness and specular/glossiness, which is the best for UE?

[Arkiras]

@BIGTIMEMASTER

And you have access to both metalness and specular in the standard material

You don’t have access to both. The specular input in Unreal takes in a scalar and only controls specular reflection intensity, the reflection color is derived from the albedo for metallic areas of the texture. In a glossiness/specular setup the specular map is RGB and affects the specular color.