When I was choosing the signature campaign, after checking most of the mixers, I chose Sinbad as the most reliable. I am still of that opinion, although certainly, the others currently active deserve respect for now.
Why choosing Sinbad as the most reliable that other do not have? Although, I do recommend Sinbad as well.
I will choose coinjoin mixers on noncustodial wallet as the most reliable. I mean those like Whirlpool on Sparrow and Samourai wallet or the Jointmarket if running your own node. I choose them because they are decentralized.
Although, if using the centralized mixer onion link on Tor browser, they are good too. One of the mixers that I have reviewed before even before I join their signature campaign is mixero. Mixero even has conversion from bitcoin to monero and back to bitcoin, or receiving bitcoin and sending mixed coin, depending on how the person that want to mix wants it.
But other mixers on LeGaulois (OP) posts are good. But the best advice is for anyone that wants to mix huge amount of bitcoin is not to send it at ones, but mix it one after the other. There is nothing bad to also use the process of using different mixers to explore which one will be the best for him that he will use next time.