Comment Really depends on the subject matter (Score 5, Informative) 415
If you're reading fiction, get a Kindle or other e-ink device, because these guys have the advantage of being lightweight, have long battery lives, and "disappear" when you're reading. You just read and read and can enjoy yourself.
If you're reading non-fiction, especially non-fiction with charts, graphs, and the like, get a tablet. They support more advanced features with ePub.
Finally, the device in many cases also ties you into a store. If you're just interested in loading up your own PDFs, you have free reign to select any tablet. If you want to read books from the iBookstore, you have to go with the iPad. If you like the Kindle store or the Nook store, you can choose most tablets OR their own tablet offering.
If you're reading non-fiction, especially non-fiction with charts, graphs, and the like, get a tablet. They support more advanced features with ePub.
Finally, the device in many cases also ties you into a store. If you're just interested in loading up your own PDFs, you have free reign to select any tablet. If you want to read books from the iBookstore, you have to go with the iPad. If you like the Kindle store or the Nook store, you can choose most tablets OR their own tablet offering.