Have you asked your users what format would they like the user guide in? If your users are okay with PDF, then stay with it. In the end, user guide and its form

Have you asked your users what format would they like the user guide in? If your users are okay with PDF, then stay with it. In the end, user guide and its format is for users, and not for you. Unless, users are requesting or indicating preferences for different format, I will suggest focus on other tasks. Personally, for user guides, I prefer PDF. It keeps the formatting and the order. I can markup the PDF with my notes and highlights. I can download and keep a copy. Wiki (information dump with no specific order of reading), FAQ (answers to most often asked questions) and knowledge base (answers to one off/unique situations) are different tools for different purposes and don't necessarily address user guides in a nice way.