A show saves the entire setup of the desk including scenes, libraries and all the various settings ( with one or two exceptions). Crucially, You can only recall shows in their entirety.
A scene saves most, but not all of the settings on the desk. However the crucial difference is that you can control which aspects of a scene are recalled using filters. So for example you could have a scene that only changes a single channel or group of channels. Or one that just changes some compressor settings etc.etc.
Hope this helps you understand the difference.
Oh, and in general you don’t want to be recalling a show during live sound. It typically takes a few seconds and goodness knows what happens to the sound during the recall. Whereas a scene recall is much faster and can be used in forcexample live theatre ( with certain oft expressed limitations).
So shows are for…. entire shows, and scenes are for… well… scenes!
