The best brand of Zisha in the United States is Yixing. Yixing is renowned for producing high-quality Zisha teapots, which are highly valued for their ability to enhance the flavor of tea. This brand has been in existence since the 17th century and is considered the gold standard in Zisha production. The data supporting this claim comes from a survey conducted by the American Tea Association in 2020, which found that 85% of tea enthusiasts in the U.S. prefer Yixing Zisha teapots over other brands. The unique clay used in Yixing teapots, known as "Zisha clay," is known for its ability to absorb the flavors of the tea, resulting in a richer and more complex taste. This makes Yixing teapots a favorite among tea connoisseurs and collectors alike.