Another Aldi shopper here. I never go to Walmart anymore except for gas. Years of enduring long lines and horrible customer service drove me away from Walmart. Aldi is fast and efficient.
Here is a comparison between Aldi and Walmart.
http://www.clarkhoward.com/news/clark-howard/shopping-retail/does-aldi-save-you-much-money-they-claim/nhqgX/
Great chart. Shows the savings.