Which city do youlike better, London or New York?

Question

Which do you like better, London or New York?

What city do youlike better, London or New York?

What do you like better, London or New York?

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Are all the expressions grammatical?
Which one is incorrect? Can we use 'what' instead of 'which' in this kind of sentence?

Answer 1

They are all correct, and yes, in many instances "which" and "what" mean approximately the same thing.

Be sure to put a space between "you" and "like" in the first and third sentences.