The best format is PDF. The epub reading experience is fine but far from perfect, unless you install some 3rd party app. Between azw and epub I'd recommend you go epub regardless.
You can use google play store but you have to workaround to get it working, and occasionally it stops working (usually after Note updates).
Annotating with stylus is very easy although not straighforward. To annotate a PDF you have to enter scribble mode which means at least 2 clicks before you can write, plus a third one once you want to exit scribble mode. You can read the book while scribble mode is enabled but you won't be able to use features such as highlighting, dictionary and so on, basically just annotation and page flipping. Also mind you, you won't be able to use scribble mode with epubs/mobis/azw, only with PDF and DJVU.
Highlightings are automatically exported in a separated .txt file. In-book annotations must be exported via a designated option. Boox Note doesn't automatically override the original PDF.
Battery is fine if you turn everything off and not overload the system with useless apps. It definitely lasts me more than 7 hours worth of reading.
The stylus is quite responsive but holding it in different angulations can mess up the writing precision, definitely unsuited for drawing.
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