[Alisa]

I think for this to really work, the criteria would have to be tiered and ranked in some way. After all, it's not just about what content you read (and most of us would pick from more than one category anyway). Also, when you combine criteria, you may get conflicting answers. As people have pointed out, where you live is a big factor. If you combine that with the criterion of not wanting to do any converting, it's a game changer. If you would prefer not to, but you're willing to do it if you have to, that could give you a different set of options. You'll covert but won't strip DRM? Different answers. Same applies to library books. You can read all of them on any device if you're willing to strip DRM and/or do some conversion. We also haven't addressed things like features: dictionary support, search, user-loadable fonts, language support, content organization, annotation. These are things that matter not at all to some but are deal-breakers for others. For most, they rank somewhere in the middle. If these questions weren't so complex, this forum would be a lot shorter.