“Which would you recommend?”
You're shopping for a laptop computer at a store. The salesperson has shown you two computers within your price range. You say this because you want to know which one he thinks is better.
Which would you recommend?
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Use this phrase when you want to ask an expert to help you choose something. For example, at a restaurant you can ask the waiter to tell you what items are best by asking:
What would you recommend?
You usually use "which" when asking for the best out of 2 things, and "what" when asking about a larger group of choices.