Benchmarked strictly across TripTiming's 5 empirical pillars: Crowds, Weather, Vibes, Prices, and Safety.
London emerges as the optimal May destination with an overall TripTiming Index of 61/100 vs 54/100 for Amsterdam (+7 point advantage). London experiences substantially lower visitor footfall and shorter landmark queues (heavy visitor congestion vs peak seasonal crowding in Amsterdam). This is reinforced by lower lodging rates (~$342/night vs ~$378/night, saving ~$252 over 7 nights). While Amsterdam retains an edge in Civic Safety (76/100 vs 57/100), London's commanding performance in Space & Crowds secures the overall May recommendation.