I don't know how good the other DNS services are but for me NextDNS is ideal especially as a level of customization (a plus for parental control with hourly restriction) , when you have a not very technical wife and a child who in 3-4 cases out of 10 clicks on any crap. I for example have activated in security everything and in privacy - Block disquised third party trackers, native tracking protection for phones and in filter lists - OISD, NextDNS on filter, Goodbye Ads, Adguard mobile filter. All of this combined with Adguard desktop/Android with their filters, the ones they maintain. So far I'm happy with the combination, my wife doesn't come screaming that something isn't working for her, my daughter has no problems with online school or browsing either and if there is a problem I can fix it quickly in Allowlist.