Objectively, ZCash has the equivalent of FCMP++ right now but there are a few issues. Firstly, most ZCash transactions are public so the anonymity set for ZCash is small and even smaller when compared with Monero which has a lot more users. Also, because of the former issue, every time you switch from public to private transactions, it taints your wallet just as it does with coinjoins in Bitcoin. There’s also a much smaller purely private ecosystem (e.g. Haveno, Atomic Swaps, Serai, Tari, DarkFI, etc), since there is less pressure to do things privately. That makes it easier for ZCash to cave to governments request, even if it didn’t have a company to target. It also lacks other features like Dandelion++ to help anonymity or P2Pool and RandomX to help avoid centralisation. Pirate chain, being a fork of ZCash, solves some of these issues by getting rid of the public blockchain but it is smaller and dependent on ZCash for new research so it is not viable yet.