The Pro Book is a different animal than Capelle's. Both have nice points, worthy books, and in Capelle's case, on occasion excessively wordy IMO. Bob Hennings book is focused clearly on the actual practice drills and skills you need to take to the table and WORK on to get better. Phil's book is a catch-all of ideas and the kitchen sink, presenting wheat and chaff with equal vigor.
If you haven't read the Pro book, I can't imagine why you would feel the need to jump in and announce PC's PYBP as the only worthy book. Is it your only book? My library of snooker and pool books just continues to grow, with Byrne, Fels, Martin, Koehler, Polsky, and more. All have some value, not always apparent on first reading, so it pays to go back through them from time to time, though I must say "The Monk"s inner stuff still leaves me cold.
One of my newer books is Pool Players Edge by Kanov and Stauch, which in some ways is more polished than Capelle's work. Smoother writing style, an intelligent narrative thread packed with on-point examples and advice from very good players and pros. Well illustrated, too.