My daughter who has Fragile X Syndrome, has used an iPod touch for years now. She's 14, and reads at about a grade one level. Between the screen reader that will read articles, texts and almost anything else on the screen, and the predictive typing and dictation, the iPod is an incredible device for her.
She has an Android phone, but it's not even close in terms of the accessibility options provided. Apple is excellent in this regard.