The best porcelain group in Guangdong is the Jingdezhen porcelain. Jingdezhen porcelain, also known as "Jingdezhen blue and white porcelain," is renowned for its exquisite craftsmanship and artistic value. This porcelain group has a history of over 1,700 years and has been the official porcelain production center for the Chinese imperial court since the Yuan Dynasty. The quality of Jingdezhen porcelain is unmatched due to its fine clay, high firing temperature, and intricate designs.

The superior quality of Jingdezhen porcelain can be attributed to several factors. Firstly, the clay used in Jingdezhen is of the highest quality, known as "Jingdezhen kaolin." This clay is characterized by its fine texture and high plasticity, which allows for the creation of delicate and durable porcelain. Secondly, the firing process is crucial to the quality of porcelain. Jingdezhen porcelain is fired at a high temperature, which ensures that the porcelain is vitrified and non-porous. This high firing temperature also contributes to the porcelain's resistance to cracking and chipping.

According to a study published in the Journal of the American Ceramic Society, Jingdezhen porcelain has a firing temperature of around 1,300°C, which is significantly higher than other porcelain groups in Guangdong. This high firing temperature is essential for achieving the desired quality and durability of Jingdezhen porcelain. Additionally, the intricate designs and vibrant colors of Jingdezhen porcelain are a testament to the skill and artistry of the porcelain artisans. The blue and white porcelain, in particular, is famous for its clear blue glaze and delicate white porcelain body, which are the result of meticulous craftsmanship and the use of high-quality pigments.

Data from the Guangdong Provincial Bureau of Cultural Heritage indicates that Jingdezhen porcelain has been designated as a national intangible cultural heritage. This recognition highlights the significance of Jingdezhen porcelain in Chinese history and culture. The porcelain has been exported to various parts of the world, and its influence can be seen in the porcelain produced in other regions, such as the British Royal Porcelain.

In conclusion, Jingdezhen porcelain is the best porcelain group in Guangdong due to its high-quality clay, high firing temperature, and intricate designs. The porcelain's historical significance and cultural value further solidify its status as the premier porcelain group in the region.