Walmart's online grocery sales have surpassed Amazon's since 2019, with Walmart projected to have 26.9% of online grocery sales by 2024 compared to Amazon's 18.5%. Customers are turning to Walmart for affordability, utilizing the company's stores and gig worker delivery drivers to fulfill grocery orders. Amazon's efforts in the grocery space, including Whole Foods and Amazon Fresh, have yet to catch on broadly with shoppers, leaving them still trying to compete with Walmart.