Who was a greater warrior Arjuna or Karna?

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In Mahabharata, Pandavas were in the path of Dharma. Kauravas did Adharma. The elder brother Duryodhana did bad deeds one after the other including defeating Pandavas in Pasha game. But history puts a question whether Arjuna or Karna who was greater warrior. When Karna's ratha or horse cart was stuck in the mud, Arjuna threw his arrow and killed Karna. Lord Krishna told Karna that if he had defeated Abhimanyu in Chakravyu by unlawful manner then he had no business asking for fighting in legal way. There were many bans (weapons) which Karna had which could not be tacked by other great warriors in Mahabharata. Their teacher Dronacharya used to considered Arjuna the best.