I've tried the rest, and Olive Tree continues to be the very best. This is the most reliable Bible reader I have ever used. Other prominent Bible apps have been unreliable when not connected to wi-fi (in church), but Olive Tree never fails. Olive Tree offers the most robust note-taking, highlighting, bookmarking of any reader. You can categorize, tag, and annotate, to your heart's content, and everything syncs beautifully. You have multiple options for syncing. It will sync with your desktop app, or with third-party solutions. My thousands of notes are synced with my Evernote account, for long-term storage and yet another easy way to search, share, and review my notes. The reference library that is seamlessly tied to your Olive Tree Bible reader is worth it's weight in gold. You can add as many reference books as you like: maps, dictionaries, concordance, study Bibles, etc. As you encounter a word or verse to research, your entire reference library is already looking at the same verse, so your maps are showing you what you are reading about, the study Bible is opened to that verse, etc. If your desire is to study the Bible over the course of a lifetime, you will be best served with Olive Tree.