A critical factor in the decision is that the LM plane flew the test criteria while Boeing had to modify the plane between trials. One version of the Boeing plane could fly at supersonic speed, then they had to remove the inlet cowling to do the vertical landing. Lockheed Martin's plane did it all in one flight. Right now we need the best design, and we do not have time to monkey around with the contract. Boeing has even suggested that the specification be revised to eliminate the short take off and vertical landing requirement. How can they get away with this.
The Boeing entry looks like something the Joker would fly in a Batman cartoon. No self-respecting fighter pilot would admit he flew that ridiculous looking bird.
Princess Leah: "You flew in THAT? You're braver even more pathetic than I thought.