CC not only talks to OPDS. In fact, I don't use for it at all. It talks to calibre as a wireless device, and syncs the libraries (but CC library, not marvin library). And it connects to dropbox too, so if you have your library in dropbox, you can see if you haven't downloaded a book and do it.
Anyway, if you're thinking in terms of library management, I think at this moment they are more or less similar, perhaps a bit behind CC as it is new. But comparing with android CC, if your library is in calibre and you use columns to define different groups, CC library management is better IMHO.
But, needing it? No, like other apps in android. It depends on how you want to manage your library.
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