AutoZone is the largest retailer of automotive parts and accessories in the United States. Advance Auto Parts is the second largest retailer of automotive parts and accessories in the United States.
AutoZone has over 5,000 stores in the United States, while Advance Auto Parts has over 3,500 stores. AutoZone also has stores in Mexico, Brazil, and Puerto Rico. Advance Auto Parts does not have any international presence.
In terms of revenue, AutoZone is nearly twice the size of Advance Auto Parts. In 2018, AutoZone had revenue of $11.4 billion, while Advance Auto Parts had revenue of $6.2 billion.
In terms of market value, or the value of all outstanding shares, AutoZone is also nearly twice the size of Advance Auto Parts. As of May 2019, AutoZone had a market value of $22.5 billion, while Advance AutoParts had a market value of $12.1 billion.
Conclusion: Based on the number of stores, revenue, and market value, it is clear that AutoZone is the larger company than Advance Auto Parts.