First of all, KFC is a Western-style fast food restaurant. Compared with Chinese fast food, the differences in cooking techniques, experience types, etc. are obvious. Western-style fast food such as KFC completely follows a fixed process, similar to Industrialized food. Chinese fast food has high requirements for chef experience. The heat, the order in which ingredients are placed, etc., all mainly depend on the experience of the chef.
Secondly, compared with other Western-style fast food, KFC mainly sells Western-style fast food such as fried chicken, hamburgers, French fries, soda, etc. It is positioned as "consumption of family members" and provides a family-style warm and reunited dining atmosphere. The consistent quality of the products and services, the simple but very effective logo design and the unified store decoration together constitute a unique external image, while the popular decoration with services focused on families and children has become its brand identity. In the United States, KFC has always been a low-end product, but in China it has become a mid-range or even mid-to-high-end product. It conforms to Chinese food tastes, which should be a crucial aspect for the catering industry. While maintaining its characteristics, KFC has promoted many products suitable for China, such as Old Beijing Chicken Rolls, Hibiscus Fresh Vegetable Soup, etc. Chicken is the king of KFC. Their ingredients are prepared and shipped by a professional ingredient factory affiliated to the head office. I heard that they are exclusively made from a variety of spices, so they are very fragrant, especially the chicken wings (although not as good as the chicken wings). (on their own company's Pizza Hut chicken wings), the taste of other drinks is not much different from other fast food restaurants.
In short. KFC is famous in China mainly because it can adapt to changes in the Chinese market and launch products that suit Chinese tastes and have its own characteristics and signature products. Personally, I think McDonald's is better than KFC.