Benchmarked strictly across TripTiming's 5 empirical pillars: Crowds, Weather, Vibes, Prices, and Safety.
Seville emerges as the optimal May destination with an overall TripTiming Index of 68/100 vs 65/100 for Madrid (+3 point advantage). Seville experiences more manageable visitor density and shorter landmark queues (carrying capacity score 48/100 vs 36/100 in Madrid). This is reinforced by lower lodging rates (~$331/night vs ~$430/night, saving ~$693 over 7 nights). While Madrid retains an edge in City Vitality (85/100 vs 65/100), Seville's commanding performance in Space & Crowds secures the overall May recommendation.