The answer to your question is solely dependent on the work you are doing and the versatility you require between ArcGIS products and those of AutoCAD. Esri’s ArcGIS for AutoCAD is the premier integration tool for CAD/GIS data. It also is an excellent tool if your GIS data requires precise editing.
ArcGIS for AutoCAD gives you access to:
If you are in position that requires work between AutoCAD and Esri products ArcGIS for AutoCAD can provide a streamlined link between CAD and GIS that can’t be matched. With this product CAD and GIS professionals can share a common standard for the data that both will be working on. Template files can be prepared with coordinate systems, basemaps, and meaningful layer names from conception. If your workflows require AutoCAD Map 3D, then ArcGIS for AutoCAD can still be of use. However, because the mapping systems are different nothing in AutoCAD Map 3D will improve your integration with Esri technology and may even cause more frustration. I would encourage you to give ArcGIS for AutoCAD a try with the free download:
Retrieving data ...