Crypto based on zerocoin seems to be the most sophisticated anonymous currencies so far. As far as I know there are three coins based on zerocoin so far: Zcash , Zcoin and Zoin (they are on crypomarketcap.com). Since Zcash doesnt have an official GUI yet, I havent used it. But I tried Zcoin, however it seems really buggy, and I'm not sure I can recommend it.
Also, there are differences between Zcash and Zcoin - Zcash hides the amount sent, but Zcoin does not.