I moved back to a laptop because I was used to what apps I used there. But let's say you use it as an e-reader. Get the Kindle. Really. Get the Kindle.
Either do it like this:
To start, I do not know anything about tablets. I have several hundred pages of notes and various word documents, in addition to a couple hundred .pdf files that I would like to store on a tablet for reading purposes. I will not use the tablet for anything else. Would I be satisfied with purchasing a cheap $50 tablet on amazon, or should I spend more on a higher quality product?