Well ideally we could have both 
Let me count the ways… 
- To get access to the last 10 years of Python language and core library improvements including improved asynchronous coding support.
- To get access to the next 10 years of Python language and core library improvements.
- To get access to the popular scientific packages numpy, pandas, matplotlib, bokeh,…
- To get access to the popular machine learning ecosystem in Tensorflow,…
- To have the popular web frameworks flask, pyramid and django directly inside Python
- To simplify co-coding with Rhino Inside
- because the Python 2 death clock is ticking
- Because IronPython3 is being developed by 1.5 people in their spare time. They have a long way to go to reach their stated goal of Python 3.4 compatibility. Python 3.4 is dropping out of support soon as it is 5 yrs old. Many new packages only support 3.5 or newer.
- CPython has dozens of core developers, hundreds of contributors and one of the most dynamic open source communities surrounding it.
Thanks for the heads up on nuget- I wasn’t aware of it. I will check it out