There's a lot we will never know about the coming zombie plague until it actually hits. One thing we can all agree on is that people make zombies. The Number 1 rule in surviving a zombie outbreak is stay away from other people. Without other people around, there could be no people turning into zombies and trying to eat you. They're also won't be other people around trying to take your stuff.
This basic philosophy can be placed against any zombie survival plan, as a test. Once you've created your zombie survival plan, and you're looking at it and you think it's fantastic, ask yourself, "Will other people want to do the same thing?" If the answer is yes, don't do that plan. You want to stay away from other people. You don't want to put yourself in harm's way by being around other potentially hostile, desperate, or infected people. When you're looking at your Zombie Survival Plan or looking at places you may travel in a zombie outbreak, population density turns out to be the most important factor.
There are a lot of important factors: Public health infrastructure, natural resources. We all need water or we'll die of dehydration. The most important element to look at in any zombie survival location is population density. Stay away from other people and you'll stay alive.