The West City Mansion property that is considered better is the one located in San Francisco, California. This is primarily due to its historic value and prime location. San Francisco's real estate market has consistently ranked among the most expensive in the United States, with a significant portion of this attributed to the city's rich history and desirable location.

San Francisco's mansions, especially those in neighborhoods like Pacific Heights and Presidio Heights, are renowned for their architectural significance and historical importance. These areas are home to some of the most iconic and well-preserved homes in the country. For instance, the Presidio Trust manages several historic properties within the Presidio National Park, including the Presidio Officers' Club, which was built in 1903 and serves as a testament to the city's military history.

Data from the National Trust for Historic Preservation highlights that San Francisco's historic homes have seen a surge in value, with some properties increasing in value by over 50% in the past decade. This is attributed to the city's robust economy, cultural appeal, and the limited availability of land for new construction. According to a report by the San Francisco Planning Department, the city has seen a decrease in new housing units being built, making historic homes even more valuable.

Furthermore, San Francisco's location offers unparalleled access to natural beauty, cultural institutions, and a vibrant urban life. The city's hilly terrain and stunning views of the Golden Gate Bridge and the Bay Area make it a highly sought-after destination for both residents and tourists. The proximity to the Pacific Ocean and the Silicon Valley further enhances its appeal.

In conclusion, the West City Mansion property that is better is the one in San Francisco, California, due to its historic value and prime location. The city's rich history, architectural significance, and desirable location make it a top choice for those seeking a mansion property.