Speaker/Traveller:
The speaker/traveller in the poem "The Road Not Taken" is characterized by his independent and individualistic nature. He takes pride in making his own decisions and following his own path, even if it means going against the norms or expectations of society. This is evident in the lines "I took the one less traveled by, And that has made all the difference." The speaker/traveller values personal choice and autonomy, and is willing to take risks in order to pursue his own unique journey.

Orthodox Mentality:
On the other hand, the orthodox mentality in the poem represents a more conformist and traditional way of thinking. This mindset is concerned with following the well-trodden path and adhering to societal norms and expectations. The orthodox mentality may view the speaker/traveller's decision to take the road less traveled as unconventional or even reckless. This mentality values conformity and stability, and may be reluctant to deviate from the familiar or the expected.

Comparison:
- The speaker/traveller values independence and individuality, while the orthodox mentality values conformity and tradition.
- The speaker/traveller is willing to take risks and make unconventional choices, while the orthodox mentality prefers to follow the established path.
- The speaker/traveller sees the road less traveled as an opportunity for growth and self-discovery, while the orthodox mentality may view it as a risky or misguided decision.

Contrast:
- The speaker/traveller embraces uncertainty and change, while the orthodox mentality seeks security and stability.
- The speaker/traveller is open to new experiences and challenges, while the orthodox mentality may be more resistant to change and innovation.
- The speaker/traveller values personal growth and self-expression, while the orthodox mentality prioritizes social norms and expectations.