I use the Calibre e-reader with custom style overrides to get my preferred spacing, margins etc. It's ugly out of the box but doesn't require much tweaking to look like Apple Books if you know css. Works great on MacOs/Linux/Windows (I use them all). If a book has hardcoded fonts/styles/spacing I don't like then I use the Calibre editor to remove them.
I don't use Calibre as a library tool, I find that pretty annoying. I just use a git repo with folders for genres and markdown file with each book for notes.
I don't use Calibre as a library tool, I find that pretty annoying. I just use a git repo with folders for genres and markdown file with each book for notes.
On Android I use ReadEra.