That's a question I get asked all the time. Which is better: Jigsaw, ZoomInfo, Zapdata or ...?
To find out the answer, check out Online Sources of B-to-B Data: A Comparative Analysis.
This excellent study by Ruth Stevens & Bernice Grossman looks at 10 vendors to assess the quantity, completeness and accuracy of their data.
First they identified 10 industries and asked each vendor for the number of companies in each SIC code.
Next, they selected well-known firms in each industry. Each vendor supplied the number of contacts in each firm, plus the # of "complete" contacts (full name, address, title, phone, fax & email).
Finally, they persuaded ten businesspeople to be their guinea pigs as they evaluated the accuracy of each vendor's data.
The results are interesting. You see, the answer depends on what you're looking for! Click here to download their analysis.
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