And or Or in the phrase, the later of this event or (or And) that event
Can anyone definitively say whether the correct word would be 'or' or 'and' when using a phrase that provide that the later in time of two events should be chosen. The example would be: "Johnny was offered to choose the later of two dates, the day of that he won a foot race _____ the day that he found a watermellon."
So, should the blank space be replaced with "and" or "or"?
Please help to settle an argument and let me know which would be correct.
Re: And or Or in the phrase, the later of this event or (or And) that event