It just depends on what it is you want to do, how much time you can take to learn a program, how often you will use the program, what your budget is and probably a host of other things.
Rhino and MoI, as has been said here before, are similar to a point. Probably the most important thing to me was the knowledge that Michael Gibson, the MoI author and main forum help person here, was also responsible for authoring the first Rhino versions as well. After designing a full-features NURBS product in Rhino, he left and decided instead to focus more on usability-- to create a solid modeler "for the rest of us."
So, if you're like many here, who don't actually live in a single 3D program day in and day out, you may find MoI suits you just fine. I'm sure there are some feature gaps between it and Rhino, but Michael has done an excellent job of optimizing usability concerns and feature creep. I think of him as the Steve Jobs of NURBS, someone who really has his finger on the pulse of what most people really want. I literally can go months without using MoI and then pick up right where I left off-- something not possible for me using other solid modelers.
If you plan on 3D printing, then a NURBS based solids modeler are certainly the way to go. Using polygon modelers, like SketchUp will be an exercise is extreme frustration.
If, on the other hand, you're focused on architecture, game or low poly modeling, then certainly SketchUp can do the trick, as can many other programs, including the free Blender. SketchUp is pretty easy to learn, but the latest 2018 release has done away with a usable free version, which is a problem for many.
IMO, you need 3 different modelers. A solid modeler (MoI), a poly modeler (SketchUp or Blender) and a topology modeler (3D Coat or ZBrush). BTW, 3D Coat has a very good sale going on right now which you might want to look at as well. HTH.
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