Kangbit and Speedris are both well-known brands of fitness protein powder in China, but they are different in brand background, product quality, taste and price. Here are some of their differences:

1. Brand background: Combit is a brand of Beijing Combit Sports Technology Co., Ltd., and Speedy is a brand of Nanjing Speedy Sports Nutrition Technology Co., Ltd.

2. Product quality: Kangbite protein powder has good quality, fresh taste and good effect of promoting muscle synthesis. The quality of instant rice protein powder is ok, and the taste is not much different from that of Kangbite.

3. Price: The price of Kangbit protein powder is relatively high, while the price of Speedris protein powder is relatively low.

Generally speaking, Kangbit and Speedris are good brands of fitness protein powder. You should choose the brand that suits you according to your own needs and budget. I suggest you try these two brands of protein powder first, and then choose according to your actual situation.