DeepOnion only focuses on the privacy and anonymity of the users and the transactions between wallets.
But in terms of price value, market capital, developers and investors - Bitcoin will stand out with also to other Altcoins.
DeepOnion isn't brainer than Bitcoin, DeepOnion didn't actually listed on coinmarketcap.com because of its anonymity.
Transparent Blockchains aren't for illegal purposes but when they do, they would be banned to some governments and states.