Other than the things already mentioned, you can read analog clocks easily from great distances, as long as the handles and the face have appropriate contrast (e.g. black on white). Even with impaired vision and large distance, being able to discern the rough position of black smudges on white background is enough to tell the time. This is not possible with a digital clock, because you can't distinguish between the digits as easily. Therefore, I'd certainly argue their much better for legibility in the back of a classroom or a lecture hall.