Those of you lucky enough to own acreage in the country and have put up supplies and have access to water have the best chance of surviving a long term event.
I've graded myself and my preps, just like they do on "Doomsday Preppers" but instead of giving myself "X" number of months to survive I look at percentages.
Realistically, in my current position I give myself a 50% chance of surviving one year of an extended event.
If I owned acreage in the country, with all the supplies and skills I have (farming, military engineering, weapons, and fieldcraft), I'd give myself a 95% chance of surviving a year.
You guys with land got it made.
The biggest difficulty I've found with having land is protecting my resources.
I believe that is where creating a community environment with neighbors will be key. Mutual protection, bartering and trade, and mutual help with maintenance issues.
Course, there's always that one neighbor who will likely be a problem.