Seven inches on the diagonal. This would got in a book great, and wouldn’t have the overhead of taking the image, dumping it to HDMI, and then sending out to the screen where the process goes backwards.
On the other hand, the ten inch screen would be a bit bigger. It requires a lot more monkeying around on the power; it’s bigger; it’s jankier.
I think it comes down to size. An intimate seven inch 800×480 versus a fairly intimate 1280×800. The fight of the century.
I should really slit down with a ruler and figure these things out.