The obfuscating technology of ring signatures is superior in terms of anonymity compared to coinjoin-based solution. However it is impractical and doesn't scale, therefore rendering the cryptonote-based coins as something like proof-of-concept, rather than usable coins that can experience wide adoption.

Also note that superiority of ring-signatures does not automatically translate to something like NSA-proof level of anonymity. Both DRK and Cryptonote can be practically anonymous for any third private party that watches the transactions on the blockchain but both can be vulnerable to NSA-tracking. If you are an individual using either DRK or Monero for example, coupled with good IP obfuscation and a high-level mixing, nobody will find your transaction. The NSA though, might.

This means that on a practical level, the technical superiority of ring signatures cannot translate into a market advantage, as both coins are anonymous as far as third-private-parties are concerned, but they both are vulnerable to NSA-level resources (where monitoring networks and even hardware devices is a reality).

If DRKTor -or whatever it's named- is a good enough alternative compared to I2P or Tor, then DRK might become the only NSA-proof anonymous coin, as it will have covered the IP obfuscation in a sufficient manner that I2P or Tor hasn't. The fact that the IP obfuscation nodes cannot be sockpuppeted without significant cost, is quite a plus. However it will require a much greater degree of decentralization where Masternodes are installed outside "big" data centers known to cooperate with government agencies.