http://syscoin.org/in-depth-look-at-the-syscoins-decentralized-marketplace-and-comparing-it-to-the-competition
Good article.
In the "Anonymous Transactions" section nothing is said about OB though. As far as I know they have integrated Tor.
I said Tor is not anon due to exit node vulnerability.
"If we look past the simplicity factor we may begin to look at ways that the blockchain approach is more secure than P2P. P2P networks which are not fully anonymized can fall victim to DDOS attacks (the classic TCP SYN ACK network flood attack). Given the fact that even TOR is not fully anonymized due to security vulnerabilities in exit nodes, I have a hard time believing that any of these projects claiming full anonymity with their P2P designs would actually stand the test of a reasonable length time on their claims."
I qualified valid features in the comparisons... things we know that won't work weren't worth mentioning especially. Will draw many people to comment on needless things. It was already 10 pages long.