Windmill Vermicelli is potato starch imported from Holland, while ordinary Vermicelli is domestic corn starch.
In terms of usage, raw flour can be used for thickening, hanging, and making purposes, while windmill raw flour is mainly used for making sauces, especially Western-style sauces.
In terms of price, windmill starch is a bit more expensive than regular starch.
To summarize, there are obvious differences between windmill starch and ordinary starch in terms of raw materials, price, usage, and place of origin.