Web.com has merged the SnapNames and NameJet inventories. So when you do a search for NameJet, SnapName domains will show up, and vice versa.
None of the metrics are infallible. They can all be manipulated. However, it's tougher to manipulate them all. So the ideal way is to use all the metrics together. If a domain has a high Trust Flo, but a low Domain Authority, you should research some more into it. The same goes with Ahrefs Domain Rating. The SEMrush Rank & SimilarWeb metrics should be used only for domains with organic traffic.