First, the brush can be used freely and is not restricted by paper. Why do many people like to create calligraphy and painting with a brush now? The reason is that it uses animal hair, such as wool, rabbit hair, chicken feathers and so on. These words written without Mao Mao pen are flowing, and the fonts are very rich and soft. This is the characteristic of writing brush, which hard pen can't reach. Of course, the lines written by the brush are very rich. Moreover, the brush is mostly used for some calligraphy and painting with large space and large font.
Second, a hard pen is just the opposite of a brush. Hard pens have beautiful fonts, and thin hard pens are mostly made of some gold, copper and iron. Therefore, his handwriting is very skinny and solid. Hard pen nib opening and closing ability is very small, not as free and easy as a brush. But hard pens like to write small characters, and their lines are simple and bright. But now the hard pen is very popular because it is easy to refit and carry. That's why everyone is now.
Brush is more suitable for large-scale calligraphy and painting, more suitable for everyone to create, and brush can not only write but also draw, which is why many calligraphers prefer brush. At that time, hard pens also had their own market. For example, many people like to use a strong hard pen to write small characters, because its nib is relatively sharp and it is relatively convenient to modify.