We buy the data and publish the scoreboard.
Every vendor claims accuracy. Almost nobody publishes the rows. We pay for the data, score it against ground truth a human recorded by hand, and put the raw file next to the result. Including the benchmarks we are in, where the method has to survive our own conflict of interest.
Employee count
Six providers, 100 companies, one field. One was 20x more accurate than another, and the price you pay predicted almost nothing about which one was right.
Email deliverability
The same treatment for verified email: who finds an address, whose addresses actually land, and what each valid one really costs.
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