I use the original choices (no cloud).
Content server for when I am away from desk and can not
Push a file from Calibre or when I just want a review without loading a book on that device.
The Sync mode of the Wireless device connection.

Why has CC now started asking me which connection (port) when I have chosen
Content server?
(I run the standalone Content server with a designated library and port, and I sometime have the WDC running on the
current library) I can understand when there are 2 or more content servers (which works

) running.