If you only travel once in your life, where will you go?

Your meaning is obvious. Now you want to go to Tibet and the prairie, right?

It's hard to decide. Both places are beautiful and have their own characteristics.

My suggestion is: if you are in good health, you can go to Tibet, because it is a plateau, and there will be altitude sickness when you go there, and the temperature difference is very large. Many tourists are unhappy because they are not adapted to the climate.