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I would hope the instructor could teach multiple styles of DMing and allow the student to take all of that has part of his learned bag of tricks. I think some games, even using the same system, require different approaches (capture the flag versus murder mystery, for instance). It is also true that some people are good at one style but not at others, though most could learn to be better, I believe. A good instructor should also be able to help a new DM use their own personal strengths to their best advantage at the table.
Quoted for Truth.
I know where my strengths lie, and I've seen some GMs who have incredible strengths in certain styles of play or certain settings (I know one GM who is incredible at political games, but weak at dungeon crawls).