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?
I used Pi-hole and AdGuard Home but they of course only work in your home LAN. So I switched to NextDNS and I'm happy (but not very happy) with it. Their DNS servers are fast and I can choose the blocklists to use myself. It also has a white- and blacklist. And the best part is that I don't need an app on my phone to use it.
The only thing that bugs me are (feature) updates. I've been using it for about a year now and I think nothing has changed this entire time. Also they still offer the Energized blocklists which are dead for over a year now. It feels like the devs don't care much about their product as long as it keeps running and people pay for it which is sad.