Koh Tao is the Smallest when compared to Koh Pha Ngan And Koh Samui. It does not have as many parties as Koh Pha Ngan has or neither does it have the luxuries of Koh Samui. Koh Tao is for a relaxed experience and vivid underwater scenes that mesmerise in every moment. Koh Tao would be the most Budget friendly place to travel.