Different categories, production processes, colors, uses, tastes and flavors, and usage scenarios. The specific differences are as follows:

1. Category and production process: Weidamei is dark soy sauce, and its production process involves long-term fermentation and aging. Weijixian uses high-tech extraction technology to extract umami substances from natural ingredients.

2. Color and use: Vida is darker in color and has a glossy tan color. It is mainly used to add color to dishes during the cooking process. The flavor is relatively light in color, reddish brown, and is more often used for seasoning, such as dipping and cold dishes, to add the aroma and taste of food.

3. Taste and flavor: Vida is known for its mellow taste and rich layering, and its taste is relatively rich. The extremely fresh taste is more fresh and tender, and is suitable for occasions where the original taste of food needs to be highlighted.

4. Usage scenarios: Vida is suitable for dishes that require long-term stewing, such as braised pork, chicken stew, etc. The extremely fresh taste is more suitable for quick stir-fry, cold salad and other dishes that require short cooking time.