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Which vs what

Good evening to everybody,
I struggle to understand the difference between 'Which size would you like?' and 'What size would you like?'.
Are they both correct? Is there a difference in meaning?
Same with 'Which one?' and 'What one?'
Thank you

Re: Which vs what

There's usually a difference in meaning:

"Which" implies a contextually indentifiable set, and hence is said to be "selective", whereas "what" doesn't and is said to be non-selective.

For example, if I go up to an ice-cream vendor and ask "What cones have you got?". He may then reply "We've got vanilla, strawberry, lemon and chocolate; which one would you like?" I have to choose from an identifiable set of just those flavours.

Another example: Suppose it was your birthday, and I ask you, "What gift would you like from me?", to which you reply, "I'd like a romantic DVD". So we go into a video store and I ask the sales assistant "What romantic DVDs do you have?". The store has thousands of DVD's available, but he then directs us to a particular shelf where only the romantic DVDs are on display. I would then ask you, "Which one would you like?" You would then have to choose from an identifiable set of just the romantic DVD's on that particular shelf.


Re: Which vs what

A very clear explanation.
Thank you.