Originally Posted by tompe
I would not thing that gray scales were important for manga which probably is what people read most on these devices.
I don't know my comic-reading ended when I was 10 with Donald Duck
So I guess it also depends on the need you have for your reader which one is the best.
For simple plain mobi-pocket reading the Cybook is (until now) superior.
For other purposes the bebook might be better.