Some products are mere tracing programs. At first glance their results look good but if you examine the DXF files they create you find they are made up of lots of short lines, often disguised as polylines. This makes editing the DXF file in your CAD program difficult or impossible. Pro minimizes the number of lines it creates. Its Gap Jumping command joins broken lines into one continuous line.
Some programs attempt to smooth the many lines they create into fewer lines.
This often displaces the smoothed vectors away from the raster image. Some programs miss details in your drawings. Scan2CAD Pro won t miss details. It s been written with the view that faithfulness to your original drawing is paramount. Some programs don't include raster tidy up tools like despeckle and deskew.