Knowledgeable or Work-Ethic? 
Which do you choose between the two?

One can get the job done. 
The other will get the job done.

Of course we want to optimize for both.
However if you ever doubt your abilities
Remember you can work your way up.

The person with the work ethic will outperform the knowledgeable one.
and over time the person with the work ethic will rise to the level of knowledge required.