I strongly recommend a tablet for reading pfs. I have a Kindle and a Sony T1 and none of them deal well with pdfs (well enough for my academic use, which means reading and annotating a large amount of pdfs). I ended up getting an iPad for that purpose.
I have some threads on the topic that you can take a look at:
https://www.mobileread.com/forums/sho...d.php?t=156702
https://www.mobileread.com/forums/sho...d.php?t=156791