Would you hire a hard working person over a more knowledgeable person?

Person A: Hard working, always willing to learn. Doesn't have much knowledge, but works his butt off. Very dedicated to accomplishing the goal.

Person B: Knows 3 times (literally) more than person A, smarter and understands what's best. He's a thoughtful architect. But, he works half as much because he's lazy and doesn't care much.

Assuming you had to pick from one as the first hire, who would you pick?