1, nutritional value: yam vermicelli has higher nutritional value and contains 16 amino acids needed by human body, while sweet potato vermicelli has relatively low nutritional value and only contains 12 amino acids needed by human body.

2. Word of mouth: Yam vermicelli has a good word of mouth and is deeply loved and recognized by consumers, while sweet potato vermicelli has a relatively poor word of mouth and is not recognized by consumers.