Have messed around with various modelers for a while now. Actually started with Aspire from Vectric. Not a true 3D modeler by any means. Moved away from it very quickly, quite tedious and sort of weird compared to other modelers. Gave Fusion a go. Spent a lot of time with it, watched and performed an excellent series of YouTube videos. My impression is that it is not very good for organic shapes, and is very rigid in terms of constructing models. Settled on Rhino. A lot to digest there, not a fast learning curve for me. My breakthrough in learning came when I learned how to customize to UI to my needs. That reduced the incredible clutter of commands. Also, a lot of the videos on Rhino are made by “command line” proponents. I like clicking icons. I have been using Rhino for 3 years now and am still learning things that are not always apparent. For instance, just realized that if I want to move a 3D hole, like a countersunk screw hole, I can just press Ctrl-Shft, select the hole and move it around to where I want with the gizmo. Suhhwweeeeet. Organic modeling is actually fun in Rhino, it has a history function so things can be changed after being drawn. What Rhino has some issues with is chamfering and radiusing on surface models. That can get tricky and frustrating at times. My learning curve was about 6 weeks, 6-7 hours a day, every day. I was productive during that time, but nowhere near what I can do today.
Hope that helps.
Edit: Tried Blender too. YIKES!!! Incredibly powerful and incredibly confusing for me. Also use 3D Coat at times to work with detailing surfaces. 3D Coat is similar to things like Sculptris and Z Brush. I am not real crazy about 3D Coat. Not real crazy about any of those actually, I don’t think I have enough artist in me to use them effectively, too much engineer.