Crime stats put out by each state and cities of that state may vary from one state from another, so I find it hard to really depend on what state is more crime free than another.
One factor is what types of crimes? Where is a better place to live...a state that allows CCW, but has a high rate of petty crimes where nobody gets hurt or a state where CCW is not allowed, has a low rate of petty crimes, but a high rate of murder?
Then another factor is how are crimes reported? If a citizen carrying a gun stopped a crime from happening, is that "attempted" crime reported as a crime stopped by an armed citizen? Probably not. It just may have been put on the books as a crime even though the crime was stopped.
Then you have to think what states where you know have a large amount of crime, but don't report every single crime because it will make them look real bad or crimes that aren't reported because they weren't yet discovered that they happened, such as a murder where the victim wasn't found yet.
Then you have to think what is a true quality of living. Living in lawless society where criminals run rampent? A society where there is no crime, but is like living in your own personal Nazi Germany and you get arrested if you look at anyone the wrong way? Or a society where there are sensible laws that don't infringe on your rights, but an occasional crime can happen and is expected, but not where people are willing to loss their rights over or truly believe calling 911 will stop a crime.