Sex change surgery in Thailand is very developed, and its technology is world-class (but still not the best). Its main advantages are low price, simple procedure and fewer surgical restrictions than other countries.

If you want to change your voice, I don't think Thailand can do it very well. The medical center of the University of Zurich, Switzerland, has tried vocal cord adjustment surgery, and the vibration of male vocal cords has increased from 1 10Hz to 120Hz, which can achieve a very good voice feminization effect. However, this kind of operation is rarely performed, and the cost and risk are quite high.