Costco (NASDAQ: COST) and Walmart (NYSE: WMT) are two of the retail sector's most resilient stocks. Both companies weathered fierce competition from Amazon (NASDAQ: AMZN) and expanded as other brick-and-mortar retailers crumbled. Over the past five years, Costco's stock soared 199% as Walmart's stock advanced 78%. The S 500 rose only 73% in comparison.

But should you buy either of these popular retail stocks right now? Let's take a fresh look at their businesses to find out.

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Source Fool.com