A file with 3DS extension represents 3D Sudio (DOS) mesh file format used by Autodesk 3D Studio. Autodesk 3D Studio has been in 3D file format market since 1990s and has now evolved to 3D Studio MAX for working with 3D modeling, animation and rendering. A 3DS file contains data for 3D representation of scenes and images and is one of the popular file formats for 3D data import and export.
PLY, polygon file format, represents 3D file format that stores graphical objects described as a collection of polygons. The purpose of this file format was to establish a simple and easy file type that is general enough to be useful for a wide range of models. PLY file format comes as ASCII as well as binary format for compact storage and for rapid saving and loading.