During the PS4's launch week (Nov. 15-22), total eBay sales for the platform were $12,554,461, compared to $7,898,233 for the Xbox One (Nov. 22-29), the firm said. Notably, the PS4's launch week covers North America only, while the Xbox One's first seven days span 13 markets around the world.

The Xbox One drove more total dollar sales on launch day compared to PS4, Terapeak said, though this is likely the result of the $500 vs. $400 price discrepancy between the platforms.

The PS4 started ahead of the Xbox One on eBay and stayed ahead. An eBay representative confirmed last month that more than 10,000 PS4 units were sold during the platform's Nov. 15-17 launch weekend, compared to 7,000 Xbox Ones sold November 22-24.

The Terapeak data also shows that the PS4 outpaced Xbox One by a massive 78 percent margin for total unit sales, with Sony's console moving 21,309 units compared to 11,992 units for Microsoft.