I agree. Obviously people who are affiliated with/have used a service personally are more likely to advocate for it.

I personally think that it's not necessarily that there is a clear cut answer, but rather what features you want to use. And research on that front needs to be carried out by the individual who is using the mixing service, e.g. whether you'd like to have private keys (chips), or simply have funds sent to an address.

At the end of the day though, I think that all else being equal, and you're looking at the two options, the objective thing to say is that Chipmixer has a much longer history and track record of being responsive and reputable, compared to other mixers that have just popped up. They may still be legit, but there is a higher risk.