Yeah I don’t really see the difference that much myself either, but you can set the visualization mode to Ambient Occlusion and switch r.VXGI.AmbientOcclusionMode between 0 and 1 and you will see the change.
EDIT: is an example https://gyazo/b4dac81d1e9c59a1cefc8ccad12815ab (command I entered was r.VXGI.AmbientOcclusionMode 1)