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There isn't a "best reader" for PDFs, because how well PDFs read depends on how they were made much more than the reader's software.
PDFs that were designed to be printed on letter/A4 paper are not going to convert well to a tiny screen; all the reflow and zoom options are workarounds. (That said, some devices do better with them than others. There are certainly *worse* PDF readers; there just aren't any that are great.)
The DX and iPad do best with them solely because they have larger screens. Neither has great functionality for PDFs--the Kindle can't search them or annotate them; the iPad is limited to 3rd-party apps that aren't compatible with its iBooks abilities.
What kind of PDF books do you have the most of; what kind of reading do you need to do with them? Some kinds convert well with Calibre and the whole issue of "best PDF reader" can be bypassed.
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