Costco Beats Aldi on Value Perception: What Shoppers Should Know

Overall Value Scores Show Costco’s Edge

In a year-long consumer survey, American adults gave Costco a value score of 38, compared to Aldi’s score of 35. While the difference may seem modest, it reflects a clear trend: when it comes to perceived grocery value, the warehouse club model has a slight advantage over the traditional discount supermarket format. Both retailers have built strong reputations for helping families keep grocery bills under control, but Costco appears to have won a bit more consumer confidence on this front.

This perception matters because it influences where families choose to shop and how much loyalty they show to each retailer. Many shoppers actively decide between these two options based on their belief about which one delivers better savings, making Costco’s value proposition increasingly important in a competitive grocery landscape.

Age Makes a Significant Difference

The headline numbers tell only part of the story. When researchers looked at consumer opinions across different generations, the results varied dramatically.

• Baby Boomers: Assigned identical scores of 37 to both Costco and Aldi, showing no preference between the two retailers.
• Generation X: Gave Aldi a slight two-point edge over Costco, making them the only age group to favor the discounter.
• Millennials: Preferred Costco by nine points, showing a clear lean toward the membership retailer.
• Generation Z: Showed the strongest preference for Costco, assigning it a score of 44 compared to Aldi’s 32, a twelve-point margin.

These generational splits reveal something important: younger shoppers, who will be the primary grocery consumers for decades to come, overwhelmingly favor Costco’s value. As Gen Z and Millennials settle into family life and expand their spending power, they are expected to shift even more of their grocery budgets toward warehouse club shopping.

What These Changes Mean for Your Wallet

The research tracked consumer sentiment from September 2025 through the following summer, and interesting patterns emerged during that period. Costco’s value score climbed in January, jumped again in May and June, then declined slightly as the survey ended. Aldi’s numbers moved in the opposite direction, gaining strength during the final weeks of the study period.

For shoppers, these fluctuations suggest that perceived value shifts with seasons, pricing changes, and promotional offers. Both retailers engage in ongoing price adjustments and deals that can sway consumer opinion. Understanding when each retailer offers the best value on your specific shopping list becomes crucial for maximizing savings. You might find that Costco’s pricing strategy works better for bulk household essentials, while Aldi might offer better deals on fresh produce at certain times of year.

The Bigger Picture for Grocery Shoppers

This data suggests that Costco has successfully positioned itself as the preferred value destination for younger American families. The membership model, which requires an upfront fee, apparently delivers enough perceived savings and selection to justify that cost in the minds of Gen Z and Millennial shoppers. As these groups grow into their peak earning and spending years, Costco appears well-positioned to capture a larger share of their grocery spending.

For Aldi, the findings indicate challenges in winning over younger demographics, despite the company’s strong expansion plans and reputation for competitive pricing. The discounter maintains solid appeal among older consumers and Generation X, but the generational gap represents a strategic concern for long-term market share.

For you as a consumer, the key takeaway is clear: your age and household stage may influence which retailer truly offers the best value for your situation. Younger families appear to find Costco’s bulk-buying model and selection worth the membership fee, while older shoppers and those without families may get equal or better value from Aldi’s traditional discount store format. The smartest approach involves comparing specific items you regularly buy at each store and letting your actual receipt, rather than perception alone, guide your grocery shopping decisions.