Oxford PPL books
It must be tricky because each person will normally only use one set of books and find it hard to compare.
I'm reading the oxford books before starting my flying, and they seem (to my limited knowledge) to go deeper than strictly necessary for a PPL. I would say that is a good thing though. I've seen some old ATPL manuals, and from what little I saw, they seem pretty similar.
They don't cover the actual flying exercises though. I know that one flying school I'm considering use the APM manual for that.
Good luck with your training....
Matthew