I would go with the freezer. I built a fridge as a kegorator and freezer both with collars and the fridge is not as efficient, I can't really cold crash in it. So if u ever wanted it as a dual purpose device your pretty much locked in to ferm chamber only with a fridge. If u have a keg setup already, or bottle, and only brew 5 gal batches then go with the fridge. I brew 10g batches and had to add a 17 in collar to my fridge for it to hold two carboys.