The combination of form-factor and genre makes a huge difference in how I consume books.
For instance, I have no trouble reading most fiction on either my Kindle or my phone - I'm reading through in a linear fashion, and there usually isn't much besides text. I usually don't have to hold every detail in my head, and can just flow along.
If I get into non-fiction, that is usually where I switch over to either print, or failing that, reading on my computer. Sometimes I can get by with my large-format Kindle DX clone, but that can be dicey. With non-fiction, there is usually a lot more paging back and forth; I may be reading a paragraph, and want to go back and double-check a map or table of figures, or re-read a section that I didn't grok the first time. There might also be footnotes or endnotes that one wants to skip to, and the experience isn't great in most reading apps. It's also considerably easier to read non-fiction on a larger screen or a textbook-size physical copy, I find - for instance, any kind of programming book usually has large blocks of code listings, and looking at those on a 27" 1080p monitor or a physical book where I can see the whole thing at full size, on two facing pages, is much easier than on a 5" phone screen.
For instance, I have no trouble reading most fiction on either my Kindle or my phone - I'm reading through in a linear fashion, and there usually isn't much besides text. I usually don't have to hold every detail in my head, and can just flow along.
If I get into non-fiction, that is usually where I switch over to either print, or failing that, reading on my computer. Sometimes I can get by with my large-format Kindle DX clone, but that can be dicey. With non-fiction, there is usually a lot more paging back and forth; I may be reading a paragraph, and want to go back and double-check a map or table of figures, or re-read a section that I didn't grok the first time. There might also be footnotes or endnotes that one wants to skip to, and the experience isn't great in most reading apps. It's also considerably easier to read non-fiction on a larger screen or a textbook-size physical copy, I find - for instance, any kind of programming book usually has large blocks of code listings, and looking at those on a 27" 1080p monitor or a physical book where I can see the whole thing at full size, on two facing pages, is much easier than on a 5" phone screen.