Benchmarked strictly across TripTiming's 5 empirical pillars: Crowds, Weather, Vibes, Prices, and Safety.
Nice emerges as the optimal May destination with an overall TripTiming Index of 66/100 vs 62/100 for Barcelona (+4 point advantage). Nice experiences more manageable visitor density and shorter landmark queues (carrying capacity score 49/100 vs 40/100 in Barcelona). Urban navigability is also slightly smoother and more predictable.