Hmmm... Sounds like you want a tablet that's good at being small as well as the usual medium-sized things. That runs up against insurmountable physical constraints.
It's going to be two devices, so it may as well be two devices as dissimilar as you can find them.
For pocket-sized devices, I would start with the Samsung Galaxt S4. It's possible that you'll find something better, but you should always start such a comparative exercise with something on the pretty-damn'-good side of acceptable.
Larger devices? I have no advice to offer.
Also: don't fall into the trap of thinking pdf's will always be dreadful on pocket devices: that's a software design problem, not a law of nature.
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It's going to be two devices, so it may as well be two devices as dissimilar as you can find them.
For pocket-sized devices, I would start with the Samsung Galaxt S4. It's possible that you'll find something better, but you should always start such a comparative exercise with something on the pretty-damn'-good side of acceptable.
Larger devices? I have no advice to offer.
Also: don't fall into the trap of thinking pdf's will always be dreadful on pocket devices: that's a software design problem, not a law of nature.