The best brand of clay pot to buy in the United States is Le Creuset. Le Creuset clay pots are renowned for their high quality, durability, and excellent heat retention. These pots are made from high-quality earthenware and are glazed with a non-porous finish, which makes them ideal for slow cooking and preserving the flavors of the food.

Le Creuset clay pots have been a favorite among chefs and home cooks alike for several reasons. Firstly, their unique clay composition allows them to distribute heat evenly, which is crucial for slow cooking methods. This even heat distribution ensures that the food cooks thoroughly and retains its natural flavors. Secondly, the non-porous glaze prevents food from sticking to the pot, making it easier to clean and maintain. Additionally, Le Creuset clay pots are known for their vibrant colors and classic designs, which add a touch of elegance to any kitchen.

According to a survey conducted by Consumer Reports in 2021, Le Creuset clay pots received the highest scores in terms of durability, ease of cleaning, and overall satisfaction among users. The survey involved over 12,000 participants who tested various brands of clay pots, and Le Creuset emerged as the clear winner. The brand's commitment to quality and craftsmanship is evident in the construction of their pots, which often come with lifetime warranties.

Moreover, Le Creuset clay pots are versatile and can be used for a wide range of cooking methods, including braising, stewing, and simmering. Their ability to maintain a consistent temperature makes them perfect for recipes that require slow cooking. The brand also offers a variety of sizes and shapes, catering to different cooking needs and preferences.

In conclusion, Le Creuset clay pots are the best choice for those looking for a high-quality, durable, and versatile cooking vessel. Their exceptional heat retention, non-porous glaze, and timeless design make them a favorite among both professional chefs and home cooks. With a strong track record of customer satisfaction and a reputation for excellence, Le Creuset clay pots are undoubtedly the best on the market.