We had a chest freezer at my mom's house growing up, and it was a black hole. So much stuff got buried and forgotten down in the bottom. Upright are so much easier to organize (though I still manage to lose track of stuff; with my old freezer it was defrosted twice a year and reorganized. I'll have to work out a routine like that for the new one.)

Chest freezers are always the go-to freezer for murderers trying to confuse investigators about the time of death. That's the other reason why I don't want to have one.