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How did the Guaranty Building differ from the Wainwright Building in its exterior materials?

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Louis Sullivan Louis Sullivan, detail of an oil painting by Frank A. Werner, 1919; in the collection of the Chicago Historical Society.

The Wainwright Building and the Guaranty Building are both notable skyscrapers designed by the firm of Adler and Sullivan. While they share similar design principles regarding their vertical emphasis, they differ in their exterior cladding materials.

The Wainwright Building in St. Louis is constructed with a red brick exterior. In contrast, the Guaranty Building in Buffalo is sheathed in decorative terra-cotta.1