I would hedge that where a MRE can be better is in low water situations (for example in the desert where you must carry uh...a gallon or more a day?). Then you can drink the water you carry and not use it in cooking.
Though with MRE's you will want to drink a lot - they can er...bind you up!

MRE's are also excellent for long term storage in emergency kits in cars/homes.
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