Are you speaking in terms of an "Information Manual" and a "POH".
The Difference is that one is airplane specific and has serial number. = expensive.
The information manual is just a cheap generic book that is not airplane specific and is not required to be in the airplane while flying. = cheap (small planes)
This may not be what you are looking for but it is what I am guessing since you are saying you are getting back into little airplane GA flying.