This is taken from the Cinni coin thread on the first page.

XC coin only anonymize half of the transaction (the actual transfer of payment). The communication between buyer and seller is left wide open and can be intercepted by a third party. There are ways to mitigate the communication risk however the communication risk to anonymity remains more significant than the payment risk to anonymity. The system being developed at CINNI will use the encrypted messaging system to allow CINNI to become the first ever completely anonymous transaction system.
Cinnicoin is claiming to have encrypted messages and 100% anonymous transactions.
https://bitcointalk.org/index.php?topic=573232.0Instead of having two coins doing the exact same thing, why not combine the two?