Best Tools for Finding Company Revenue Data: HG Insights, SMarte, Crunchbase, Clearbit, and Alternatives

Im looking for a few options to find company revenue using clay. I see they have HG insights, SMarte, Crunchbase and Clearbit. Any one have an opinion on which of these is the most accurate and if there is another one out there that is better. Preferably cheaper! I see they also use a google search using glassdoor.