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Which of the following is correct?

  1. Which one do you want?
  2. What one do you want?

closed as general reference by MetaEd, Matt E. Эллен, Mitch, tchrist, Kris Oct 11 '12 at 5:43

This question is too basic; it can be definitively and permanently answered by a single link to a standard internet reference source designed specifically to find that type of information. If this question can be reworded to fit the rules in the help center, please edit the question.

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If you're offering a limited choice, then use which: "Which of these 25 models do you want (to buy/try/look at)?"

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But if there are endless possibilities, use what: "Now that you've won the lottery, what do you want to buy, a Rolls, a Benz, a Ferrari, a Lamborghini?"

"What one do you want?" isn't idiomatic English, but "Which one do you want?" is.

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In American English, which one is a common phrase. What one is not, and it sound very stilted.

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Which is used to refer to a specific object, while what is referring to a more general selection.

In your case, "which one" do you want is correct. You can also change it to be "what do you want".

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