1, the nib design is different: the nib of a signature pen is usually spherical, which is convenient for signing and writing. The nib of a ballpoint pen is usually a ball, but unlike a signature pen, there is a rotatable ball on the nib, which can roll on paper to let oily ink flow out.
2. Different usage scenarios: signature pens are usually used in formal occasions, such as signing, signing, etc., while ballpoint pens are more suitable for daily writing and taking notes.