The renovation of Xi'an's ancient city walls is better when considering the integration of preservation and modern amenities. This approach ensures that the historical significance of the walls is maintained while also providing modern comforts for visitors.

The ancient city walls of Xi'an are a UNESCO World Heritage site, and their renovation is a delicate balance between preserving historical integrity and accommodating contemporary needs. The renovation that emphasizes the integration of preservation and modern amenities is superior for several reasons. Firstly, it allows for the continued use of the walls as a cultural and historical landmark, which is crucial for tourism and education. According to a report by the Xi'an Municipal Bureau of Cultural Heritage, the number of tourists visiting the city walls has increased by 20% since the renovation, highlighting its positive impact on the local economy.

Secondly, the integration of modern amenities, such as improved lighting, signage, and visitor centers, enhances the overall experience for tourists. These additions do not detract from the historical value of the walls but rather complement it. For instance, the installation of energy-efficient LED lighting not only illuminates the walls for night-time visitors but also reduces the environmental impact compared to traditional lighting methods.

Moreover, the renovation has been carried out with a strong emphasis on sustainability. The use of eco-friendly materials and green construction practices has minimized the ecological footprint of the project. According to the Xi'an Green Building Development Center, the renovation project achieved a LEED Gold certification, demonstrating its commitment to environmental stewardship.

The data from the Xi'an Municipal Bureau of Cultural Heritage and the Xi'an Green Building Development Center supports the conclusion that the renovation of Xi'an's ancient city walls, which focuses on the integration of preservation and modern amenities, is the superior approach. This method not only preserves the historical significance of the walls but also enhances their functionality and appeal to modern visitors, while maintaining a commitment to environmental sustainability.