We evaluated both companies for these use cases: data appending and email validation. We decided to implement RingLead. RingLead had one additional feature that I thought was beneficial--data segmentation. Either way, you have to append your data and fill in your critical white space for effective lead nurturing and RTP. Critical data is the "who, what, where.." Who is interested (job title, persona, size of company), what are they interested in (critical when you have multiple product lines to support like we do at Western Digital), and where are they (country, region, geo). Hope this helps.
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