I use Inkscape because it’s free. My impression is that illustrator is more powerful, but up to now Inkscape has done everything I’ve wanted to do.
I used to use SketchUp for 3D and now use Fusion 360. You can see why here:
I’ve been told that the new SketchUp is now parametric as well. But I’ve now gotten used to Fusion, so I’m not going back. I’ve found it difficult to get a good SVG output from the free version of SketchUp in the past. I’m not sure if that has improved at all either.