I use them both. But not a lot. I use them for different reasons. I use DN Journal for a roundup of the months sales, and NameBio more for research of a domain (and surrounding domains) potential value. NB definitely has a bigger broader database.
You should trust both. They get some of their info from the same places and both requires proof of sales. NameBio just shares faster and continuously now. Whats not to trust?