> If I'm going to invest in learning a new application, I'd rather it be an open one.

I wouldn't worry about it too much. The concepts are very transferrable.

At work I used to use SolidWorks exclusively, now I'm using Onshape and will probably switch to Inventor soon. At home I typically use Fusion 360. They all work more-or-less the same and moving between them isn't too hard.