Hows the MBA WX program from NMIMS

The PGP refers to the standard 2 year MBA programme whereas the PGPX refers to the 1 year executive MBA offered by many Indian institutions.

PGP= Post Graduate Programme (in Management)
PGPX= Post Graduate Programme (in Management) for Executives.
PGP is your regular MBA/PGDM while PGPX is what people call "Executive MBA"

PGP is more concentrated, more thorough and more complete, it provides you better knowledge hence better career opportunities after graduation or with less experience.
So as per the information you gave above you can apply for PGP accordingly.

Good Luck.