Looking at the schedule, it’s simply a choice between a ~10.45 departure from CPH with 5.5h layover, or 13.45 dep with 2.5h layover.

If you have the chance to see Copenhagen in the day(s) before your flight and would just be hanging around at the hotel in the morning of departure, then your choice of the earlier one makes sense to me.

By contrast if the later one would allow you to do something fun in the city which you would otherwise miss out on, then better to make use of that time.