Depends on what you plan to put in it. If mixed formats, choose plain text so Calibre won't stomp on your raw data. Let the Notes Viewer do the interpretation, since standard Calibre cannot.
New Release in Job Spy:
https://www.mobileread.com/forums/sh...4&postcount=25
Please shift to the Job Spy Thread for future posts about Notes Viewer. Thanks.
DaltonST