I didn’t mention quality.
Plexamp follows a whole different philosophy. You will get the whole extent of it only by using it. And the best bits of Plexamp are only available with a Plex Pass.
So for a free user, it is mainly the differing operating philosophy.
Here is a little list of what Plexamp can do, of which only a few things are available in the general app: [How To] Plexamp 4.6.1
