It's different, DeepOnion is natively integrated into the anonymizing TOR network with additional transport protocols such as Obfs4 and Meek allowing to connect to the TOR network even in countries restricting access to it, it aims at adding additional layers of privacy such as stealth adress (next step coming very soon), zero knowledge and transactions mixing.
The main difference in my opinion except this approach to privacy is the community and VoteCentral feature which is a vote system for holders to suggest and vote for future developments.