Originally Posted by Andy_T
why? The screen is the same size. Or do you refer to the ease of holding it?
No, I am referring to the software.
In portrait mode we can choose between fit to screen, fit to width, fit to hight, zooming by increments or (the best thing of all) "two point/line cropping" that will quickly and easilly crop the margins exactly where we want it (more details on how-to in the link below) and if we then switch to landscape mode it will occupy the whole width of the screen, whereas kindle would normally not use a few millimeters on the left and right.
For bigger formats there is pdf reflowing (scans included !!!) .
It also reads djvu, epub, cbz etc.
More info on other capabilities at: