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AutoCAD is 2D (3d is primitive)
Inventor is 3D package with Material selection, Piping, Tubing, Sheetmetal, weldment etc.
Inventor is best of Engineering Design of Parts, Mechanisms, Machines, Equipment's etc. Future projects / drawings shall be generated in least time.
In inventor easy to make modification in parts, and changes shall be updated in all drawings automatically which saves a lot of time and reduces repetitive works.
Both Products are by Autodesk, Autocad is always the best option. The use of Autodesk Inventor is Good good for working with mechanical field and generation of drawings are good for Related Mechanical or mechanics field.