It depends on what you mean by regular freezers. If you mean the one you find in combination with your fridge then an upright freezer offers you a great deal more space. If you mean a chest freezer...
When you empty your freezer, put your frozen food in a cooler or cardboard boxes and top with layers of newspaper, so nothing thaws out. Then, get some old, clean bath/beach towels and fold them up...
Upright freezers stand up like a refrigerator. It doesn't open up like a chest and it can be easier to find what you are looking for with all the shelving units.