What's the difference between 要 and 想 for "to want"?
Where I'm from, people usually say 想要. 想 is more for "to think", and 要 has a flavor of "to need/require", though it really all depends on the context. 想要 mixes the two meanings, kind of like "to want" has both "desire" and "necessity".


  我渴了，我想要喝水。


I am thirsty. I want/need to drink water.


  我要上這門課才能畢業。


I need to take this course to graduate.


  這道菜看起來好好吃，我想點這道菜。


This dish looks delicious. I want to order this dish.


  你想不想一起去北京？


Do you want to go to Beijing?