Generally, Koh Samui tends to be slightly more affordable than Phuket, particularly when comparing mid-range and luxury lifestyles. In 2026, data suggests that the overall cost of living and tourism in Phuket is roughly 10% to 15% higher than in Koh Samui. Phuket's mature luxury market and its status as a global hub mean that high-end villas, fine dining (including several Michelin-starred spots), and transport can command premium prices. Transport is a notable factor: Phuket's lack of a comprehensive public transit system often forces tourists to rely on expensive "tuk-tuks" or taxis. In contrast, Koh Samui offers a more compact layout with cheaper shared taxi options and slightly lower restaurant prices on average. However, Phuket has a much wider range of budget hostels and street food options due to its size, so ultra-budget travelers can survive on similar amounts in either location. For a "mid-range" comfortable vacation, Samui usually wins on value.