Aside from the cloud bits I think the most notable way they are different at the moment is that they have their new configuration variable sets functionality, which maybe core FreeCAD hasn't agreed on yet (it's also not finished I believe).

Ondsel are seemingly using that to integrate with recalculation of designs in the cloud compute facility (think Thingiverse customiser but a bit less basic).

I eagerly anticipate that in mainstream FreeCAD, because none of the alternatives are great -- e.g. Spreadsheet is simultaneously cool, powerful and utterly exasperating once it's well-integrated. I am sure we will see it.