dd/mm/yyyy isn't objectively better IMO. It's what you're used to, making it easier for you to read. It's not what I'm used to, making it harder for me to read.
yyyy-mm-dd is the best format because it's sortable and unambiguous and standard: https://en.wikipedia.org/wiki/ISO_8601
yyyy/mm/dd isn't standard or commonly used AFAIK, so best to avoid it.
mm-dd-yyyy also isn't standard or commonly used AFAIK, so best to avoid it.