What made you stick with the one you are currently using?
I became fully aware of Control D only yesterday as the name was vaguely familiar to me when I heard it and for Adguard DNS well I thought it was a normal-ish DNS service like 1 1 1 1, quad9, Google, etc... (not that user configurable).
I tried looking for some reviews and discussions comparing the 3 but found almost nothing about Control D and Adguard DNS but I did stumble upon Control D CEO 2 blog posts comparing Adguard DNS and NextDNS to Control D.
There seems to be not that much talk about these 2 unlike NextDNS which seems way more popular, if I'm correct then what made it way more popular and known?
Some people don't like that AdGuard is made by Russian's. I like NextDNS because it's simple to use and AdGuard was to heavy to install on my OpenWRT router. Never heard of Control D until now
Some people don’t like that AdGuard is made by Russian’s.
That's a fair concern, tho. I use Yandex Search occasionally because it works better than other alternatives in my personal case. But if you care about privacy (duh, we're in /c/PrivacyGuides), using services provided buy US, Russia or China is not a good idea.