Which one is more valuable, the post on the balcony or the preface on the orchid pavilion?

They are all valuable.

1. "Tie on the Upper Balcony": "Tie on the Upper Balcony" was written by Li Bai, a calligrapher of the Tang Dynasty. Its content records Li Bai's life insights and life experiences, and has important historical significance and artistic value.

2. "Lanting Preface": "Lanting Preface" is the representative work of the Eastern Jin calligrapher Wang Xizhi. It is known as "the best running script in the world" and its artistic value and historical status are extremely high.