depends on your taste. I Like the palma for reading in bed, while I like the leaf2 (7") for everywhere else.
When you lie on your side, the palma is very comfortable. The rows are much shorter and you don't have to move your eyes from left to right as much :)

The screen, particularly in horizontal mode, makes for very comfortable reading. The length of the lines is similar to that of a paperback (or even longer if the font size is reduced), but it represents about half a page. So you have to change pages more often. This is not a problem, since not only the touch screen, but also the buttons allow you to change pages without moving your hand. As the level of customisation of the display and formatting is very high in the pre-installed reading application, it's easy to find a setting that suits your reading.