How did no one mentioned Keyshot?
IMO it is the easiest to get decent images from. It even have a Live Link plugin for rhino, and, if you name the materials in rhino the same name it has in Keyshot, you can automatically apply those materials at import.
I got it because it was what we had when I started my internship, but I love it. And since I always render boats, I started saving my self made materials with easy to remember names and cut in half the render worktime. Most what I do now is tweak the lights and place the cameras.