I would be grateful for a comparison between the capabilities of Cinderella and Geogebra, for teaching at all levels, but especially at the college/university-level. I became a reasonably adept user of Cinderella, but have only dabbled in GeoGebra.
Here is my naive, nonexpert sense of where matters might stand:
Cinderella is more mathematically sophisticated, but now less actively supported, and with a smaller user base than GeoGebra. So it might be wise, pragmatically, to "switch" to GeoGebra.
To support my sense that "Cinderella is more mathematically sophisticated":
"Cinderella's mathematical kernel is implemented entirely over the complex numbers"
"GeoGebra does not support complex numbers directly"