Both are comparable IMO since both are DNS resolver services with differences in the feature sets. Otherwise, we wouldn’t see many comparisons online. However, not both of them are respecting users privacy due to the fact that only NextDNS logs users IPs and domains by default (opt-out), while Quad9 doesn’t log any identifiable user data.
Of course, we’re talking about privacy, after all. How could I am not reluctant about having to create my account or feeling good about having my log on the cloud?
The problem is logging, as explained on above. Whether I have to send them my IP and domain is not relevant here, as long as they’re not logging me. Unfortunately, NextDNS is happily logging you by default, while you don’t even have an option to have Quad9 logging you.
I prefer to use any service as anonymously as much as possible. Having to give my email (even if it’s just an alias) instead of just saving a link, which is uniquely identifiable to my setup anyway, is not my cup of tea. My point is that NextDNS seems to love my personal info for no appearance reason.
I am not even sure whether both you and Valynor actually watch the test result. Otherwise, you wouldn’t keep saying that both of them are good at blocking sites, both of them are doing the same thing, etc. Even with the testing list that made up of purely known/suspected malicious domains like you said, NextDNS lets those domains in at a whopping number at 33.11% out of 8,333 domains tested!!! About the same as Cloudflare 188.8.131.52 (unblocked setting). While only 0.79% of the domains survive Quad9 blocking.
I am not here to defense for Quad9 or to attack NextDNS. I am here to expose my concern to the fact regarding my security and privacy when using NextDNS. It’s not even my debate. I didn’t even debate anything until this post. Having a 300,000 queries per month limit along with an inability to know whether I am getting log (after 7 days) is a “tangible” downside in my every day usage with NextDNS. Ads and tracking can be mitigated by Brave Shield that I use, plus Brave show me how many ads I blocked without cloud logging.