Restaurant Brands International (NYSE: QSR) owns some iconic fast-food chains, including Burger King, Tim Hortons, and Popeyes. They've been generating some impressive same-store sales numbers in recent quarters, making the company a potentially excellent investment even amid unfavorable macroeconomic conditions. But how do these restaurants compare to McDonald's (NYSE: MCD), which has also been delivering some strong sales growth of its own?

A key metric for restaurants is comparable-store sales (comps), which shows how much revenue has risen at restaurants that were already open a year ago. This excludes any gains that a chain would have benefited from simply by opening up new locations, and it gives a better indicator of the level of growth its restaurants are generating.

Here's how top restaurant chains Tim Hortons, Burger King, and McDonald's have been doing in the past few years in terms of comps:

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Source Fool.com