Atmospheric Fog and Exponential Height Fog

After reading the documentation and watching several tutorial videos a little confused as to why you might choose Atmospheric Fog over Exponential height Fog.

​​​​​​​Is Atmospheric Fog a simplified version of Exponential height Fog, or has it been deprecated in favor of the latter?

Atmospheric is a more subtle effect and more difficult to configure.

I always use Exponential.

( But no, one does not replace the other ).