I've always used autocad and inventor and am pretty well versed in both. I looked at Rhinocam some years back and wasn't overly impressed, but that doesn't mean it hasn't progressed., Out of curiosity I recently downloaded Fusion 360. Like Inventor it has the cam module built in and is pretty easy to use. It Mirrors Inventor in a lot of ways and I was surprised how powerful it was for machining. I also have Aspire and Artcam, but if I was just getting into cad and cam I really think Fusion 360 is a good option. Lots of online tutorials and help. It's import and export options are pretty good. Being able to use the same cad/cam for my mill, router, plasma or even 3d printer is really convenient. The newer cad programs with the built in cam that includes adaptive clearing, roughing and finishing are pretty easy to learn and use.