According to Huang Renyu, what is the difference between Bai Juyi's Song of Eternal Hatred and Du Mu's poem "Passing the Huaqing Palace"?

Bai Juyi's Song of Eternal Hatred gives deep sympathy to Emperor Tang Xuanzong and Yang Guifei, while Du Mu's Passing the Huaqing Palace is more of a satire.

Expanded:

The Song of Everlasting Hatred is a long narrative poem by the Tang Dynasty poet Bai Juyi. The poem graphically recounts the love tragedy between Emperor Xuanzong of Tang and Yang Guifei. The poet creates a moving story with historical figures and legends, and reproduces the reality of real life through artistic images, infecting readers for thousands of years with the theme of "Long Hate". The poem has had a profound influence on many later literary works.

Three Poems on Crossing the Huaqing Palace is a group of poems written by Du Mu, a writer in the Tang Dynasty. These three poems borrowed from the past to satirize the present, selecting typical events and scenes such as Emperor Tang Xuanzong's supplying lychee to Yang Guifei at the expense of the people, Emperor Tang Xuanzong's gullible lies and prolonged intoxication, and An Lushan's huaxuan dance for Emperor Tang Xuanzong and Yang Guifei, etc., and summarizing them artistically, which not only summarized the history skillfully but also satirized the reality profoundly and expressed the poet's incomparable indignation at the supreme ruler's extreme extravagance, and his desertion and misuse of the country.