Hi Andreas,
If you're getting serious about robotics, especially utilising parametric and computational control, I'd suggest you do significant amount of research prior to spending the money on mac Rhino. I, personally, made the switch back to PC due to the sheer amount of libraries and that parametric, at the moment, is mostly PC. Keep in mind Python in Rhino is Iron Python 2.7 also, which is built on Microsoft's .NET.
Just something to consider, good luck!
Karl