What is the difference between Sanxingdui and Jinsha site Museum in Chengdu? Which is better?

Sanxingdui is located in Northeast of Sanxingdui archeological site, west of the famous cultural city of Guanghan, on the bank of Jian River (commonly called Yazi River), 40 kilometers (about 24.9 miles) north of Chengdu City. It is a cultural relic of the ancient Shu (Sichuan). If you want to visit a place to know more about Chinese Shu (Sichuan) culture, make it this one, for the civilization shown by the cultural relics can be called a true wonder.
Jinsha Relics is located in the northwest of Chengdu, about 5 km from downtown district. As a theme park-style museum, it is for the protection of, research into and display of Jinsha relics and archaeological finds.
Both of them are worth visiting.

Thanks Peggy for the information.