You'd have to be an idiot to use Zerocash, considering who funded the research.
This^^, Zerocash has too many flaws. Rather use Darkcoin.
Zerocoin and Darkcoin have flaws.
Monero on the other hand...
Darkcoin will be implementing Ring Signatures and I2P, plus it's existing masternodes which is better anonymity than Monero/Bytecoin I'm sorry to say, we also don't know that much about the CryptoNite protocol.