I have Stellarmate, Astroberry and an RPi with Raspbian/Kstars installed. I did the learning on the Stellarmate by following the YouTube tutorials. It was a long, painful process. I recently installed Astroberry and was able to get it setup fairly quickly since I had learned the process with Stellarmate. I haven't tried the Raspbian/kstars installation yet.
Some of the differences I have noted between Stellarmate and Astroberry:
The Stellarmate Wi-Fi setup seemed to be a little easier. I haven't figured out how to configure the Wi-Fi on Astroberry to automatically switch between Wi-Fi networks and the internal hotspot/virtual access point.
Astroberry seems to be a little easier to connect to and use remotely because the remote operation is implemented using a web server on the Astroberry RPi. So the remote computer needs only a web browser and kstars does not have to be installed on it.
Astroberry has a telescope mount simulator for learning how to use it. I couldn't find the telescope simulator on Stellarmate.
- correction: I found the telescope simulator on the windows installation of ekos/kstars. I just found it in the RPi installation under the "others" category. It was very difficult to find.
Astroberry appears to have a polar alignment tool although I haven't tried it yet. Stellarmate does not appear to have that tool.
- correction: Stellarmate does have the same polar alignment tool. The polar alignment tool in SharpCap looks much easier to use.
I am interested in hearing about other experiences and comments from the Astroberry author.
Ed