Trader Joe’s and Costco top the list of consumers’ favorite U.S. grocery retailers, according to a new report.

London-based market analytics firm Dunnhumby Ltd.’s inaugural Retailer Preference Index measured consumers’ retailer preferences by means of a 15-minute online survey of 11,000 U.S. households. Participants were asked to rank stores based on quality, store experience, price, convenience, digital presence and other factors.

The top ten retailers in the survey include a mix of traditional supermarkets and newer formats:

  1. Trader Joe’s
  2. Costco
  3. Amazon
  4. H-E-B
  5. Walmart
  6. Wegmans
  7. Aldi
  8. Sam’s Club
  9. Sprouts Farmers Market
  10. Whole Foods Market

The study also found that price and quality are far and away the top drivers for consumers when it comes to picking a retailer. “While there has been focus on the growing importance of digital, convenience and personalization, this study demonstrates that the best performing retailers are achieving high performance by excelling at the retail basics — right price, right products, and the right store experience,” according to the study.