I am only aware of one cryptocurrency which truly protects your privacy: Monero.
Anything else (especially PIVX, Dash and Zcash) are just promoting to be privacy orientated, while in fact it is trivial to de-anonymize the transactions. I never heard of Partricl, so i can't talk about that.

But if there is any other crypto which is truly(!) private, i'd be glad to hear about that. Especially about the technology used. But the mentioned ones (except Monero) are definitely not privacy-orientated.

If someone is really interested in protecting his privacy, he should either use coinjoin, a proper mixing service or Monero. [/list]