All the guides are good. All are by area or type of chip, Nevada, AC, Riverboat, WA, CA, Fl, etc. so it depends on your area of interest. There is not one book that covers all chips. The Chip Rack (TCR) is the best for Nevada chips. It is the most up to date Nevada guide. Contact Andy Huges for TCR. The Campiglia / Wells book is also good but is a couple years old. It does cover chips from Nevada and other areas of the US but not all US chips.
Paul