The "Organon" is actually a collection of works by Aristotle, not Plato. Aristotle's "Organon" is highly regarded in the field of logic and has been influential in the development of logical theory.
If you meant to inquire about Plato's contributions to logic, while he did not create a formal system of logic like Aristotle, his dialogues often explore logical reasoning and dialectics.
So, to clarify:
- Aristotle's "Organon": Good in logic.
- Plato's contributions: Not formal logic, but significant in philosophical reasoning.