I hated the side by side fridge at our rental house. The freezer was too narrow especially with the ice maker and food packages never fit right, ziplock bags would then just be stacked on top so if you wanted the pizza you needed to pull everything piled on top off of it. It was a pain and a fight to fit things in there.
I said when we get our own fridge it'll be a top/bottom and that's what we have. We have fridge up top freezer down below. The freezer has a main bottom part with a separator in the middle then a drawer that pulls out, in the door is a pizza storage spot although we often use it for bags of frozen veggies. The top part with the fridge has a lower drawer we use for meat, then three drawers on top of that (one used for cheese, another dough items like biscuits, and the last used for veggies), then you have the main part with the shelves, one shelf is the adjustable kind (which I really wanted) with half the drawer able to slide under it for taller items so we put milk, crystal light container when we make it, lemonade, etc there.
We do have a deep freezer in the garage that we use for frozen half pound meats, chicken and whenever we make the freezer meals but could still technically get by with the bottom freezer. A side by side configuration wouldn't work well as a substitute for a deep freezer due to constantly having to stack things on top of each other, pulling items out just to get to something.