Although this question is subjective, I would say Gili Trawangan offers the best experience for tourists and backpackers. This is because it is significantly larger than the others, and there are many more activities to do on Gili Trawangan. It is more likely that you will enjoy a holiday at Trawangan compared with the others for this reason alone. However, it is important to mention that there are some truly stunning spots to stay on Gili Meno and incredible private villas on Gili Air. Gili Meno's beaches are breathtaking, and Gili Air has an exciting yoga and meditation center worth visiting. To conclude this answer, I would say that although Gili Trawangan offers more, it is still very easy to visit all three of them. In this way, you can decide for yourself which one you prefer and why. To do so, you can buy a ticket for a public boat transfer from the ferry terminal at Gili Trawangan.