I have all of the above and I very much recommend
https://thea320studyguide.com/?olsPage=products it’s my favourite one in particular because I like a physical book which you can get this in (not sure though about USA shipping) I’m sure the iBook is just as good. It’s great when you just need a refresh of things as it doesn’t bore you in detail and is a nice read.
i also have
Airbus A320: An Advanced Systems Guide on the iBook format (shame they don’t do a hard copy) as it goes into lovely detail and the pictures are brilliant. It’s great learning about things such as LGCIU’s etc and it actually shows you what they physically look like and where they are. FCOM just get boring.