Amazon and Walmart are the top retail stocks, but one of them is the clear winner.

Amazon is seeing great operating leverage in its e-commerce business. Walmart is the more defensively positioned retailer given its role as the largest grocer in the U.S. Amazon has the cheaper stock.

Amazon is the king of e-commerce, and the company is only expanding its lead through the use of artificial intelligence (AI) and robotics. The company now has more than 1 million robots operating in ...