There are several advantages to #10 cans. They are easily stored and fit into smaller areas. They have a super long shelf life (25 years). And if you have a large family or group you are feeding, they come in full cans of the same meal.
The disadvantage is if you are feeding only one person, once you open the #10 can you have 7 days to eat it, and will be forced to eat the same meal every day until the can is empty.