Ortiz's The Annotated Erdnase, has more historical content than Vernon's Revelation/Revelations. Vernon's annotations are more about the move and its uses. Neither text is better than the other. Ortiz is recognized as one of the foremost experts on crooked card practices, but Vernon was one of the most influential magicians in modern times and had all of Erdnase memorized when he was 13. Each has a section on newer moves and variations. They both have extraordinary content, so the choice is yours. If you are going to seriously study The Expert at the Card Table, then I would definitely recommend both.