Coins using coinjoin protocol for anonymity will fail because coinjoin isnt anonymous at all. Darkcoin is using coinjoin. Monero had problems with bloating the blockchain, dont know is it solved or are they also coinjoin based? Razorcoin isnt really a competiter ? What about XC I know they failed at their first try also on their second ? Crypt and voot are just scam coins . Cloakcoin is already anonymous but only using exchanges, now the big thing is coming POSA a innovative way for private transactions after that decentralized market.
Monero is a bytecoin fork that uses the cryptonote protocol. The bytecoin code is a new source written from scratch for anonymity and right now provides the best anonymity. However the codebase is still very immature and isn't more than assembly code. Not something that is mature enough to invest in at present. Once the code matures it will be a viable option but long term code maintainability just isn't in their pipeline atm. Boolberry's developer has actually made the most progress out of all the Bytecoin forks in terms of blockchain bloat.
The other anon crypto on the market all originate from the coinjoin protocol which shouldn't be looked at as legitimate privacy solutions. Anoncoin is working on their version of Zerocoin but it has yet to come to market.
Cloak is at the forefront of bitcoin forks for privacy and anonymity. Moving past the anontech into supporting services is where Cloak will really shine. Whats coming down the pipeline is a decentralized paypal/ebay model with a focus on anonymity (OneMarket/CloakSend). This is the road cloak is going down. It will be a HUGE step forward for crypto and essentially will be redefining ecommerce.