BTW, if you really can't overcome your hatred of Windows, you can run Fusion 360 in Apple OSX. That assumes you don't a similar hatred of OSX of course!
Onshape was in public beta testing way before Fusion hit the scene (I was involved with it at that stage) but as noted, you have to pay full professional pricing for any meaningful add-on and your work is publicly visible. They must have been really p155ed off when the Fusion pricing model was unveiled....
I really can't imagine how you object to what Fusion offers you - everything from full 3D CAD, through sheet metal, surface modelling, FE and modal analysis, full simultaneous multi-axis CAM, 3D printer slicing, 2D drawings etc etc. It's now very well sorted and most features you'd ever need are implemented. The technical support is very solid and comprehensive. It's used by some serious professionals (check out Peter Stanton for instance), so is clearly very dependable. And above all, it's absolutely free and unrestricted for hobby users like us. Is it just me?
You can create your work in Fusion and output it directly to your 3D printer. If you need to go back and change anything, you can do that by simply switching from the manufacture menu to the design menu. No need to be exporting work between programs as STLs and all that palaver. But that might take all the fun out of it!