When analyzing companies' balance sheets, many investors compare assets to liabilities with ratios like the debt-to-equity ratio. In the video below, Fool contributor Daniel Sparks suggests to instead focus on a company's ability to service its debt. Specifically, he suggests using the debt burden ratio. Comparing Apple (AAPL 1.06%) and Google (GOOGL 0.18%) on this metric to other blue chip stocks, these tech behemoths look extremely compelling.