Hi Sid,
Use what looks the best for what you are trying to achieve…. (not the kind of answer you want, I know, but to be honest, I’ve never touched that value).
Now, in 4.3, things get really interesting (and also a lot more complicated/closer to reality) in the Volume Scatter Shader; have a look at this page: https://docs.blender.org/manual/en/4.3/render/shader_nodes/shader/volume_scatter.html
