another decent alternative fallback with the same featureset is quad9
Quad9's goal seems to be about threat-detection and prevention.
It would be nice if you could have both simultaneously (and maybe you can), but at the moment both services are actually quite different.
The only way you get that in a more generic sense is if a specialist DNS CDN provider started up that provided DNS services for all the existing CDNs (or they all agreed to some type of federated standard that let them share the same recursive multicast IP addresses for DNS resolution).
It's amazing how fast it is.