The article misses that Rand's books are romantic, whereas Gladwell is a journalist. Rand writes fiction; Gladwell writes theories based on anecdotes and statistics. For an analogy, that'd be a lot like saying "Pablo Piccasso, or xyz modern photographer: Who is right?"
Not sure what profession has to do with a comparison of beliefs.
To some extent, yes. As I said: Gladwell is like a Rand villain. But they aren't polar opposites. I doubt Rand ever saw the world as stylized as she wrote it. She's openly a Romantic Realist.
Gladwell opposes Rand. But they still hold fast in certain things. The opposite of Rand is not the person who says that people aren't responsible for their success. It's the person who says that civilization isn't a success, that human beings are beasts, that the solution to our problems is to go back to being savages. Similarly: I think Rand would disagree with Gladwell's claim that nobody is responsible for their life, but she wouldn't dispute his findings. She would just argue that they aren't as relevant as Gladwell thinks they are.
Not sure what profession has to do with a comparison of beliefs.