I have a kindle paperwhite, an iPad Air and an iPad mini
I like the kindle paperwhite because it doesn't need to charge regularly. It is for books only though. For travel, I tend to take the iPad mini because I can browse the internet, read and play games. We actually originally bought the iPad mini for our trip to Italy where I stored maps, restaurant information and overall tourist information. If you are an amazon prime member, you get one free book per month to read with the kindles. Otherwise, there are lots of free/cheap books to use and you may be able to check out books from your local library.