I think it comes down to wether you want a 7.8" (Nova) or a 10" (Note 2)
Reading PDF is, in my opinion, not possible on a 7.8" - and I find it challenging on the 10" Note 2 which I recently acquired for that purpose (I also have a 7.8" Pocketbook.)
About weight, depends on what you can tolerate - the Note 2 feels light enough to me to hold while reading, but everyone is different. Can you order from a store with a return policy?
Wish you good luck with your quarantine and the virus!!!
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