i dont know what scrobbling is but as someone who has both apps I have found that "equalizer" is my preference in many ways.
its easier to use, its easier to manipulate the eq settings, it has better options for playlists, and general music browsing, and more things i cant think of right now.
though i havent properly a/b'd i actually found myself swearing it even sounds better. surely a possibility.
i have contacted both of the devs on multiple occasions via their respective websites which i found via the itunes store. The equalizer app guy recently put out a new version and i know a few of his fixes were at least partly based on my suggestions, so i know he's active, and listening.
any ideas you have for either dev i would certainly recommend shooting them an email.