Don't do an upright. They are typically frost free. They cycle the temp and wreck your food quickly. Also all the cold spills out when you open it. Chest is only way to go.
I've heard that before but have never seen any evidence of it. I've had an upright and chest for many years and they both keep stuff frozen. Maybe certain brands have issues?
Not sure how the cold spilling out has any bearing on its utility, either.