Adding another option to the mix — BookShelves is a native reader for iPad and Mac. EPUB, PDF, and comics (CBZ/CBR/CB7). iCloud sync across devices, built-in free book catalogs (Standard Ebooks, Internet Archive), and Calibre library import with full metadata. $2.99 one-time, no subscription.
More detail and discussion here:
https://www.mobileread.com/forums/sh...d.php?t=372622