Benchmarked strictly across TripTiming's 5 empirical pillars: Crowds, Weather, Vibes, Prices, and Safety.
Phuket emerges as the optimal March choice with an index of 69/100 vs 68/100 for Koh Samui. While both cities offer viable travel windows, Phuket benefits from more favorable lodging value (standard room rates) and manageable carrying capacity ratios.