Hi Anthony ...
I came from Autocad to Rhino and then discovered MoI3d some time ago. Now I do as much of my work as possible with MoI (it's a joy to work with) and switch to Rhino 5 for dimensions and rendering tools. This combo works well for me. I anticipate that when 'dimensions' are available in MoI that I will not use Rhino much at all and will not upgrade to Rhino 6.
For rendering I use Sim Lab Composer and Octane ... both of which can read .obj files created in MoI3d.
cheers,
eric