Benchmarked strictly across TripTiming's 5 empirical pillars: Crowds, Weather, Vibes, Prices, and Safety.
Copenhagen emerges as the optimal December destination with an overall TripTiming Index of 59/100 vs 56/100 for Amsterdam (+3 point advantage). Copenhagen experiences more manageable visitor density and shorter landmark queues (carrying capacity score 70/100 vs 56/100 in Amsterdam). Sightseeing is further aided by comfortable outdoor weather (1°C feels-like). While Amsterdam retains an edge in City Vitality (53/100 vs 36/100), Copenhagen's commanding performance in Space & Crowds secures the overall December recommendation.