Honestly, I would take the 2pm. The airport in Copenhagen was a bit confusing when we first got there and there were long lines everywhere. You have to hit a few stops even before security. 2pm would be a comfortable experience. Like someone said, the airport is a bit of a drive too. Assuming you could carry your luggage off at any time of night, I would say you would want to leave the ship NLT 4am for the trip, check in, security, etc. I seen several people have problems with the passport check-in and security and ended up taking a lot longer getting to the secure area.