Let's say you buy all the ingredients for your meal. You choose a recipe which is using meat.
From the shop, you get raw grinded meat that is still good for a week. (label says so.)
Which will last longer?
A) The raw meat in the fridge (and prepare it when you want it.)
B) Prepare the meal, cool it down properly and put it in the fridge.
C) Freeze the meat and unthaw when you need it the next few days.
(C is an extra option, as I doubt it's a handy option if you just want to prepare the meal the next day or the day after that. But again, I couldn't find any evidence back anything up.)