Epoxy resins or cement based grout for driveway?

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We are laying a driveway made out of basalt setts, 100x100x50mm. So I think this means grout will be 50mm deep. The supplier of the setts was recommending annepoxy resin, but I wasn’t fully clear on why? What are the pros and cons of expiry resin vs cement based mortar/grout for laying setts? The joint line we will go for will be about 12mm wide.

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Appears the Paving Experts used epoxy grout to repair Hitchin market place..

 

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More from their Web site.. https://www.pavingexpert.com/point_ncc01