1. Historical and cultural value: Xiangyang ancient city is one of the important ancient cities in the history of China, with a long history and rich cultural heritage. There are well-preserved ancient city walls and many historical sites, such as the Zhong Xuan Tower and Zhaomingtai, which can help visitors to know more about Xiangyang's history and culture. In contrast, although Tang Cheng also has historical and cultural value, the historical and cultural background of Xiangyang ancient city is more profound.

2. Food features: The food in Xiangyang ancient city is also a highlight, such as the famous Xiangyang beef noodles and Xiangyang bean curd. These foods have strong local characteristics, allowing tourists to taste local delicacies while visiting. In contrast, Tang Cheng has few food features, which can't be compared with Xiangyang ancient city.