Benchmarked strictly across TripTiming's 5 empirical pillars: Crowds, Weather, Vibes, Prices, and Safety.
Seoul emerges as the optimal April destination with an overall TripTiming Index of 66/100 vs 60/100 for Tokyo (+6 point advantage). Seoul experiences substantially lower visitor footfall and shorter landmark queues (moderate footfall vs heavy visitor congestion in Tokyo). This is reinforced by lower lodging rates (~$220/night vs ~$383/night, saving ~$1141 over 7 nights). While Tokyo retains an edge in Weather Comfort (81/100 vs 76/100), Seoul's commanding performance in Space & Crowds secures the overall April recommendation.