Cantonese dim sum originates from Guangzhou (廣州), which is located in southern China. Shanghainese dim sum, on the other hand, comes from Shanghai (上海). The two styles of dim sum are quite different, and you’ll find that each region has its own unique dishes. Cantonese dim sum is typically lighter and more delicate, while Shanghainese dim sum is heartier and more filling. Cantonese dim sum also tends to be sweeter than Shanghainese dim sum.