The answer is not simple
If it is just for play - no more than a couple of days then all styles are great
If it is long term - the ghost allows for cleaning every day but some men find that this is a little to open and the foreskin gets caught.
then the leopard is better but you will need to be released at least once a week to clean thoroughly.
Some uncut men have design their own style of hook/ring that is then used in the Ghost PA style cage.
hope this helps