"PDF 2.0 fixes many of the ambiguities that were present in the previous standard, provides concise and clear PDF specifications, and includes a range of new features that can be applied in many fields that rely on PDF."
PDF file creates a static image, tables, images, and other elements and well retain the original layout as well as eBooks. While EPUB has its outstanding feature-support reflowable content, the text display can be optimized for the EPUB-reading devices.
PDF file can be created to take notes, highlights, annotate, etc with Adobe Acrobat. However, EPUB can be read-only, no editing function...
"EPUB is a popular way to feed ebook creation process, because is an open format and is based in HTML, while Amazon's format is proprietary. EPUB is the "first step" content format in many production process and supply chains.
An EPUB file is a ZIP archive that contains, in effect, a website—including HTML files, images, CSS style sheets, and other assets. It also contains metadata. EPUB 3 is the latest version. By using HTML5, publications can contain video, audio, and interactivity, just like websites in web browsers"