Neither comes with software, but FreeScan is freeware and works with both scanners.
As to the differences, look at our wiki. Under the Scanner Master logo, float your mouse over Wiki then select Radio Models from the pulldown. In the writeup that will appear, click on the blue Digital Trunktrackers link. That will take you to a wiki category that lists all the digital trunktrackers. Select the models from the list you wish to view