I've been using Sketchup (free version) for years but in the last couple  have started using OnShape.  The problem is that switching gears is tough so, even though I usually curse at Sketchup every few minutes while I am using it, I tend to go back to SU, especially for quick and dirty designs.  I guess you would call them sketches.  I mostly use Onshape for more intricate designs, especially for 3D printing.  The great thing about it is its parametric design paradigm.  If you do it right, it makes revisions so easy.  

Does Sketchlist us a parametric approach?  

--Nathan, TX. Hire the lazy man. He may not do as much work but that's because he will find a better way.