Etsy (NASDAQ:ETSY), a peer of eBay (NASDAQ:EBAY) in the retail industry, trades at a lower valuation based on price-to-operating-income metrics. However, it stands out for delivering stronger growth in both revenue and operating income compared to eBay.KLEINMACHNOW, GERMANY - APRIL 24: The logo of Internet auction house eBay glows at the company's German headquarters April 24, 2006 in Kleinmachnow, Germany. Germany is among eBay's biggest markets. (Photo by Sean Gallup/Getty Images)Getty ImagesThis discrepa ...