It's native and more direct.

Rather then adding an additional compile cycle:

- run Python code to generate OpenSCAD code

- render OpenSCAD code to see output

OpenPythonSCAD creates a .py code window in the OpenSCAD interface which one interacts with in the same way as a .scad code window (there's even basic support for the Customizer).

I suspect it would be really easy to port SolidPython to work w/in OpenPythonSCAD (if it hasn't already been done)