Amazon tops dunnhumby Retailer Preference Index as consumers prize price, speed & safety during pandemic Amazon blew past traditional grocers H-E-B and Trader Joe’s to secure the coveted title of best overall grocery retailer in dunnhumby’s fourth annual Retailer Preference Index, which also placed the company at the top of its new “Covid Momentum Metric” that evaluates customer safety ratings with an eye towards the pandemic. The announcement comes after a tumultuous year for grocery retailers as the pandemic pushed consumers to shift how they shop and what they buy, and accelerated their adoption of e-commerce – a place where Amazon has long dominated. At the same time that Amazon helped initiate a wave of first-time online grocery shoppers it also opened its first Fresh grocery store – a move designed to create a seamless grocery shopping experience, and which helped solidify its value in many Americans’ eyes.