Dehydrated beans are more expensive but much easier to deal with. Let 'em soak for 8-10 minutes and you're done. Equally important as your food stores is having a proven method of preparing them. Backpacking, I used to throw food in my pack and go, which brought about some unfortunate surprises. Fuel requirements, cooking times and methods, don't always work out like you planned. So I say whatever foods you're storing, practice preparing them just as you would in an emergency situation so there are no surprises.