Thanks all for the input, plus thanks to the person who made and posted the comparison table at
https://comparisontabl.es/e-readers/ which was super useful.*
I think at the moment I am going to try to get more used to my Clara 2E, since I already have it. But I now have a better understanding of Android in general and the Boox devices in particular, in case I do decide to go that route.
*I see the creator is Guido Lobbrecht, not sure if it was he who posted it or someone else.