Biluochun and Longjing tea are both one of the top ten famous teas in China. They have the following differences:

1. Different origins: Biluochun is produced on the south bank of Taihu Lake in Suzhou City, Jiangsu Province, while Longjing tea is produced in Longjing Mountain, Xihu District, Hangzhou City, Zhejiang Province.

2. Different raw materials: Biluochun uses spring tea, and Longjing tea uses young tea buds.

3. The processing methods are different: Biluochun uses the process of "killing → rolling → frying", while Longjing tea uses the process of "killing → frying".

4. Different yields: Biluochun is a relatively rare tea with a small yield and a relatively high price, while Longjing tea has a relatively large yield and a relatively low price.

5. Different tastes: Biluochun's tea soup is sweet and refreshing, with a mellow taste and a strong floral aroma; while Longjing tea's tea soup is mellow and sweet, with a soft taste and a light stir-fried aroma.

In short, Biluochun and Longjing tea have their own characteristics and can be chosen according to personal taste.