[autopsy]

Hey all. I have a question on my homework I'm a bit confused about. It is not something that is probably going to be on a test, but I just want to answer it correctly anyway just incase it does.  The question reads, what gives us better evidence of acid strength, evolution of hydrogen or pH? And why is this so? My text talks briefly about both, but does not mention which is better.  Thank you!
                                                Steph