A sharp pen will look better than a dark one at first. The sharp pen is not thick enough to write very small and fine words. And the sharp nib is easy to be damaged.

A pen with a dark tip is not as beautiful as the tip, but it can be made very carefully, and it can write very thin and small handwriting, which is very useful for office. Compared with the bright tip, the dark tip is not easy to be dirty and damaged.

If it's signature practice, just be sharp.

If you are doing office work, bookkeeping or studying, it is recommended to do it secretly.