Since my iPhone is almost always with me, I read a lot on it ( kindle app). However, I read on my iPad and my Kindle. It's great to a lot of options. The iPhone's retina display is great. Even after several hours, I do not get eye strain. For outdoor reading, nothing beats the Kindle. For in bed reading, I use a light with my Kindle. To me, the iPad is a good Ereader but isn't as ergonomic.