I watched the whole program and I must admit I was incorrect.
The Lockheed bird does use thrust vectoring to some degree, though not to the extent that Boeing's does.
Also, Lockheeds "Lift Fan" is more complex and risky than Boeing's pure Harrier style model. The trade off is that it saves weight, is less hard on the surfaces it lands on, has less risk of ingesting it's own hot air (something that I am doing now - I am now eating the hot air I gave off with my last post
it allows you to put the engine in a better place (The rear).
Despite the fact that Lockheed chose a more risky path to meeting the STOVL requirement, they managed to put out a bird much closer to a production version. They also had higher weight margins than Boeing's entry. This impressed the military, apparently.