There is an interesting thread in the forums about MREs VS Mainstay Meals. Both types of meals are good for what they are designed to do. Its not a matter of which one is “the best”, its which one fits your needs the best.
MREs – have a short lifespan, especially if they are stored in a shed, or somewhere where it gets hot, say above 90 – 100 degrees. I think its something like 1 day over 100 degrees takes 1 month off the life expectancy – but dont quote me on that.