Not sure what a double is.
I grew up with a freezer on the top fridge about half my childhood, and a freezer on the bottom the other half. Neither really worked very well because it was hard to organize contents where you either weren't stooping to get into what every portion was on the bottom (freezer or fridge).
My wife and I have had side by sides for over 40 years and it seems to be the best of both worlds. Stuff you use most frequently in either the fridge or freezer are at the top, less used items at the bottom. Cuts stooping down a lot.
Never had a second freezer as a 27 cubic foot side by side held everything we could ever need, over a months worth of groceries in the freezer when both kids were still home. Now it's just two of us, both the fridge and freezer are half empty.
Only thing we would NEVER get again is an ice maker and water through the door. They break frequently, are expensive to fix, and our current one leaked and ruined the floor under the fridge.