Pet food quantity - large package or small package?

I buy smaller portions of pet food. When I had dogs I would buy a lot of single sized small dog meals, that were easy to prepare. It also took the guess work out of portion control. I know it's odd but I also enjoyed buying different flavours and making sure my dog wouldn't have to eat the same meal twice in a row. When it came to dog biscuits however I'd often buy a big bag, as that's how they normally come.