i tried Dune 3D earlier today.
as an ex-maintainer of SolveSpace, my conclusion is that Dune 3D is the spiritual successor to SolveSpace: same solver, similar (but more powerful) workflow, significantly more powerful geometric kernel
SolveSpace still excels at being minimalist and polished (it will never use OpenCASCADE, for one), and it doesn't use rage-inducing GTK UI patterns, but other than that i can't think of reasons not to use Dune 3D instead