The practical differences come down to four things: whether the enquiry is exclusive, whether the supplier owns the source, how records are verified, and what happens when one is bad. Lead Foundry sells every enquiry to one broker only and generates supply on brands it owns. Where this page describes another supplier, it describes only what that supplier states publicly, and brokers should confirm current terms directly with them.
Compare cost per placement rather than cost per lead, exclusivity terms in writing rather than in marketing copy, whether the supplier can evidence the origin of a record, and the replacement process. A cheaper shared lead worked against several competitors usually costs more per placement than an exclusive one.
Every enquiry is sold to exactly one broker and is never resold, recycled or shared. Every enquiry is generated on a website Lead Foundry owns. Wrong number, fake name and duplicate enquiries are credited back. Disputes are filed in the broker portal and reviewed within one business day, with the credit applied to the next fortnightly invoice.
Ask for the exclusivity term in the written agreement, not the sales call. Ask which domain produced the record and check who owns it. Ask what verification a record passed and what evidence is retained. Ask the window for raising an invalid record and how the credit is applied.