What is the difference between Power InRoads, InRoads or Suite InRoads???

Hi everyone

1.What is the difference between???

1.  Power InRoads

2.  InRoads

3. Suite InRoads

2.Can I create in all 3 software  the same how Model terrain, Horizontal Alignment, Vertical Alignment, Cross fall, Corridor, Super-elevation and more to design road??

3.Which of the three programs has more functions??    

4. Where I have more functions  Power InRoads, InRoads or Suite InRoads???