XDN anonymity is the same as Monero because both use CryptoNote technology. But XDN has private encrypted messages with self-destruction feature, that makes XDN more anonymous than Monero. You can use messages not just for sending message but also to include some private transaction info, like payment ID (encrypted payment id).
We are working on XDN core and its security. We are trying to make it more secure with the new types of PoA blocks.
Not quite the same, since Monero now enforces minimum mixin of 2 on transactions, and it will soon be 4. This improves the privacy of everyone using the network, see here for more info:
https://lab.getmonero.org/pubs/MRL-0004.pdf
Monero also has a much longer emission and much higher hashrate for the entire time of emission. One party controlling a huge amount of coins/tx outputs means that they can possibly unmask others txs, see here for more info:
https://lab.getmonero.org/pubs/MRL-0001.pdf
This is certainly an issue for Bytecoin, and the probability of it being an issue for XDN is much greater than XMR due to the aforementioned differences in emission.
Finally, Monero has implemented confidential ring signatures, which will go into effect in the upcoming hardfork in the next few weeks. This technology will completely mask the amount being sent in any transaction. This is something that no other Cryptonote will have when it goes into effect.