Volumetric Fog & Light Shafts; are they different? Which one is better?

Pretty much the title:

Volumetric Fog and Light Shafts.
Are they the same thing?
Which one is better?


Light shafts kind of look similar, but the big difference is that they are a post process effect and it’s not physically based, if you don’t see the light source then you don’t see the effect. Volumetric fog creates shadows within fog that line up with where the light is coming from, it’s physically based and you can still see the volumetric effect without seeing the light source.