I'll never get a chest freezer again after going upright.
this is an argument in my family , well only between my mother an law and I
her dad was a butcher and said never anything but upright , you loose your meat in the bottom and it is ruined by the time you find it.
he died in 77 so he has been gone a while.
he was also a butcher in Down town Madison where you don't get gifted a cow on a short notice phone call , hey I got one , you want it , vet says it's fine to eat but the processor can't get to her in the next 3 days or won't take her cause she has a still born calf still part in her.
My argument is the slightest thing pushes into the door on the upright and it opens up and can't keep cold and you loose everything and burn up the compressor.
I cleaned up after that at the the in-laws house a couple times.
so if your talking storing frozen pizza , steaks and boxed meals and such an upright is great for finding your stuff and using it
if your wanting to get the most in and not have it push your door open the win goes to the chest
even if the lid doesn't seal well you don't loose everything it can keep cold with the chest
if your piling bags of fur in , the chest is the way to go
if your freezing 200# of ground and you organize it in one side of the chest freezer and the next cow goes on the other side the chest holds more
so it really comes down to POU philosophy of use , how are you going to use it decides what is better for the task.