Comparing cassava vermicelli and sweet potato vermicelli, cassava vermicelli will be better.
Tapioca vermicelli and sweet potato vermicelli, they are different from the selection of materials. Sweet potato vermicelli is extracted from sweet potatoes, which is usually eaten by the groundnut. Tapioca is extracted from the root plant, usually with sweet potatoes or cassava to extract more, so the two kinds of ingredients are not the same.
Tapioca flour made of vermicelli with water and heat cooked, it will be transparent. And sweet potato vermicelli words processing time, is generally a gray thin strip state, and fans are similar, after cooking its transparency is also the general state. So in the color above, there is a difference between them, cassava vermicelli will look better.
Difference in details
Tapioca vermicelli is slightly elastic in texture, while sweet potato vermicelli is relatively more starchy, so it doesn't taste as q-bouncy, more soft. So in terms of taste, these two kinds of vermicelli is also has the essential difference.
Because tapioca contains a certain amount of acid, which is toxic, so it must be soaked in water and then cooked before eating. The sweet potato vermicelli does not contain acid, so even if the sweet potato vermicelli is not fully cooked, it can be eaten. So if you eat tapioca made from tapioca, you must remember to cook it, and the sweet potato vermicelli can be selected according to their own taste, half raw or fully cooked.