Is the rapidform best software for STereoLithographic format .or you will go any other software to clean the clouds ,to generate the tight fit 3d cad.

Yes, Rapidform which is Now Geomagic Design X is best software for Reverse engineering Projects and Geomagic Wrap is also good for 3D Scanning.

yes geomagic software is used for Reverse engineering

Certainly Rapidform (now GEOMAGIC DESIGN X) is one of the best Reverse Engineering Softwares to clean up the point cloud and do the meshing operation to create the polygonal model in STL format which can be processed further to create3d model and use the Accuracy Analyser that will assist the user to make sure the model created is matching to the point cloud data captured. However, the clean up of the point cloud and creating STL is possible with other softwares as well, eg Polyworks.