Certainly now it is Monero , but Spectre is the best one for privacy , and in future it can cost more expensive than now.
Monero cryptographers are actually studying SPECTRE to see if it can be implemented in Monero, but it is this SPECTRE
https://medium.com/@avivzohar/the-spectre-protocol-7dbbebb707b5You may be talking about spectrecoin which is a shitcoin with dubious claims (specifically anonymous staking).