I've tried all three and I currently use the free ControlD Ads & Tracking DNS resolver and I've been very happy with it. It filters a fair amount of garbage domains in my experience and I don't want to spend time finely tuning the blocklists a DNS resolver uses. I use it over Adguard DNS because I noticed it blocks a few more domains in my observation.

I think most people talk about NextDNS because of the level of customizability it offers, if you want to finely tweak the blocklists and whatnot your resolver uses. It also has a pretty good web interface showing you all kinds of stats and whatnot.

You also have to keep in mind that ControlD is newer in comparison to either NextDNS or Adguard DNS by a few years, so there's likely less people discussing it as it's a little less known.