Every big brand in the fast-food space works a little differently when it comes to how it keeps its customers coming back time and time again.

McDonald's relies on the strengths of its classics such as the Big Mac and Quarter Pounder, making tweaks to overall quality over the years but keeping them as similar as possible, since they know customers have loved them for decades.

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Taco Bell, however, has a very different strategy. The Tex-Mex fast-food giant operates very much at the speed of social media, offering new menu items all the time and frequently collaborating with big brands like Cheez-It to power constant interest from its devoted fanbase.

McDonald's is very much a chain where people go decade after decade, and

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