Bitcoin private is an open source and decentralized cryptocurrency platform that delivers a decent level of privacy, by providing the option to keep both party of transaction and the amount as private. Bytecoin is also private open source and decentralized cryptocurrency platform that was created from scratch, based on CryptoNote technology which focuses on privacy and anonymity of transactions. Both coins are great for privacy, but bitcoin private has a name bitcoin in it and it may attract more people to use this private cryptocurency. However byte coin offers additional features such as unlikable transactions. For more detail please watch this video.