[andrew_]

This is classic "your answer is not my answer." And it's a form of bias. You passed on the person who knew how to write a more complex solution to the problem, and chose the person who chose a more simplistic route. But there's zero commentary on whether Candidate 2 had the knowledge required to write the complex program to solve the problem. Whereas Candidate 1 could have (likely) been easily taught what the command line alternative was.

Your process seems flawed as it appears to operate solely on your bias, from this description.