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I have only experience with a Nexus 7-2013 and the iPad 2 (which is slower than the 2012 version of the N7), and honestly, if you felt that the tablet felt sluggish when reading PDFs, there is a snowball-in-hell chance that you'd be comfortable with viewing PDFs on an e-ink reader. (Sony is working on a 13" one, but I expect it to be rather costly.)
The regular iPads are 9.7", and quite good for PDFs. Not so much because of the screen size, but because of the aspect ratio: 4:3 is much closer to DIN-A4/letter format than the 16:10 of the Nexus 7. The iPad Mini is just short of 8", and also has an aspect ratio of 4:3. But yes, both the mini and the regular iOS devices are relatively expensive for what they offer. If you opt for a mini, definitely wait for the next model. The current one's hardware is pretty dated.
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