Also of interest are numbers from ChannelAdvisor suggesting that eBay is doing something right with all of the changes it's made in recent years. During the stretch from Thanksgiving to Cyber Monday, eBay saw much better gains this year than it did last year during the same period, outperforming Amazon in the process.
eBay vs. Amazon for Sellers
Reasons to Choose eBay Over Amazon for Selling
Reasons to Choose Amazon Over eBay for Selling