Vegetable butter is artificially extracted, English margarine. Trans fatty acids in vegetable butter are very harmful to human health, but have not been attracting people's attention. In fact, when the structure of the fatty acid changes, its nature also followed the change.

Animal butter refers to the fat extracted from milk. Vegetable butter is used for one thing because it is relatively inexpensive, but also because some people are allergic to milk. (It's like a diabetic would eat sugar-free sesame seed paste.)

So it's recommended that you try to go with animal butter if you don't have an allergy, because vegetable butter is actually not good for you!