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In my opinion, current small screen eink readers were meant to target people who enjoyed paperback novels. Imagine having a magazine page or a newspaper page displayed on one page of these small screen devices.
I think the targeted consumer for the small screen devices are for those who enjoy reading paperback novels which can be read comfortably on the small screens. For most purposes ePUB should handle this fine.
The reason we are only starting to see larger screens is because of the cost. eink screens are relatively new and pricey. I'm sure we'll see larger screens offered in the future and perhaps those devices will support PDF which displays things like Magazines and multi-column texts well.
So we'll see ePUBs for ebook novels and PDF's for things like magazines/newspapers/textbooks. Somethings just won't display well on a 6" screen, like why magazines and newspapers aren't printed in paperback size paper. So I can't see why both can't coexist since as mentioned before, ePUB tends to work well with small screens and PDF would work better at displaying larger sized documents on larger screens.
When asked is ePUB better or PDF better? I guess it depends on the situation.
My opinions of course.
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