What are the advantages of closing a question for a specific reason versus just deleting it?
One benefit I can think of, if the question is closed as exact duplicate, is that it provides some referencing value: someone can find the closed question in google, and then go to the original one. This person might not have found the question is the duplicate didn't exist. Is closing instead of deleting, in that case, considered a good practice?
Side question: in what cases should I simply delete my question instead of voting to close it?