Not sure you've understood the article, or at least I don't understand your question in relation to it. What would make a DNS server the "best" in this regard?

Not sure you've understood the article, or at least I don't understand your question in relation to it. What would make a DNS server the "best" in this regard? From my point of view, anything supporting cookies and RRL is going to be sufficient, which means any standard server out there is fine to use.