Good question. PADS Professional has some great differentiating technology for this market segment. There is too much to list here, but some of the key features/functionality are:
- Advanced high-speed constraints
- Powerful Sketch routing
- Area rules
- Hierarchical 2D/3D planning and placement
- Advanced drawing and documentation
- and more...
I suggest you take a look at pads.com for more information, and view this webinar: https://www.pads.com/multimedia/pcb-pads-pads-professional-look-inside-webinar.