I can't recommend one now, but there are protocols that ensure that even the coordinator of the coinjoin doesn't know which inputs and outputs you registered. So basically, as long as you use Tor correctly and your client checks everything very *very* thoroughly (especially the blinded signatures), you should be fine

@Peter Todd wrote a nice piece on this here: https://petertodd.org/2025/coinjoin-comparison . I don't recall him making a specific recommendation though. Personally, having listened to a few coinjoin updates on Bitcoin Optech, I'm a bit nervous about current implementations

I understand enough cryptography, mostly coming from Chaumian Ecash (Cashu), to see how an excellent protocol could be made, with excellent software. But I feel like coinjoins need more attention. I hope someday we have a very good standardized protocol, and a single very-high-library library which is used by all wallets. So that a typical Bitcoin block is mostly just one big coinjoin

For example, I'd love to see all the Lightning (and Ark?) implementations doing their funding transactions and cooperative exits via coinjoins.