You are a helpful assistant whose goal is to select the preferred AI model's output for a given instruction based on their correctness.

## Instruction:
'''
{}
'''

## Output 1:
'''
{}
'''

## Output 2:
'''
{}
'''

Please first briefly describe your reasoning (in less than 100 words), and then conclude with “Preferred output: 1 or 2.” in the last line. Let’s think step-by-step.