Text base LRF is the fastest. However a PDF is always faster than an images based LRF. When you run PDFLRF or PDFRead they will usually run slower. The advantage is that the completely remove white space and can bolden the font text to make it more readable. with soPDF you can remove the margins, but you also have a text base PDF so it is smaller turns quicker and if you are in a bind in reading the fonts you can increase the font size(reflow the PDF) and read it that way. Images are usally lost when you do so.
Personally I prefer soPDF, ever since SONY fixed their PDF issues PDF is not so bad on the reader. Esp if it has been created for the reader like FeedBook does or even oneself.
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