Mastercam is BY FAR the best and most powerful I've used.
Then Gibbs. (Been using it since the Mac days of GibbsNC/CAD/CAM and Dos days of Virtual Gibbs)
Those two I know the best, with many years on each.
Then Cimitron. (Great for surfacing, haven't done much other type of work with it)
Then it's a tossup between things like Geopath, Surfcam, Bobcad and several other's I've used.
San Diego, Ca
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(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)