Is ps preferred over pdf format in some cases? Some people use ps over pdf format for their paper.

Are there some advantages of ps format over pdf format?

Thanks!
No.

There are no advantages of PS over PDF.

Any modern computer system that can display PS files can also display PDF files. (The converse is certainly not true.)

Any modern computer system that can produce PS files can also produce PDF files. (Again, the converse is not true.)

Any material that you can present with a PS file can be presented equally well with a PDF file. (Again, the converse is not true.)