Chances are, if you're an American, you have a membership to either Amazon (NASDAQ: AMZN), Costco Wholesale (NASDAQ: COST), or both. Each retailer has generated tremendous long-term gains for its shareholders, with Amazon dominating the online marketplace and Costco thriving with its network of wholesale warehouses.

But which stock is the better buy right now? Let's dive into their latest financial results, balance sheets, and future growth opportunities to find out.

For the first category, let's look at two essential financial metrics for any company: net sales and free cash flow.

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Source Fool.com