I'd much rather have a PDF. I can open it in Documents (from Readdle), which is super-fast and lets me quickly page through large documents, which is essential

I'd much rather have a PDF. I can open it in Documents (from Readdle), which is super-fast and lets me quickly page through large documents, which is essential for reference-type material or textbooks. I am also sensitive to bad typography and sadly most ePub readers fail miserably at this. I don't want a "blob of text" with random font sizes.