This is to tell which anime is superior to the other.
Natsu Dragneel VS Monkey.D.Luffy,
I think this would most likely will end as a draw because,
1.Luffy is made of Rubber but Natsu's Flames can destroy anything plus he is good without his flames too but for luffy thats hard because you never see him fighting without his powers.
2.Luffy is an at the advantage too because he can predict most of his moves using observation Haki well i don't think it works like cobra's predictions does it he doesn't read mind cuz when he predicted the Pacifistas moves because Pacifistas are robots or machines not like the real one.
3.Natsu's flames are sacred or special flames(sorry forgot) they are called flames of emotion but Luffy has Armament haki so that could match.
4.Luffy has won if speed is compared to each other if luffy goes gear second then speed is a advantage for him and a disadvantage for natsu.
5. By durability Luffy has a lot of Durability but so does Natsu but when you see his state in the war to save ace he went to the prison and the war it doesn't mean that luffy has only seen death have you forgotten lisanna she was dead remember for them but Natsu didn't lose his mind.
6. Natsu lightning flame dragon mode is useless here cuz luffy is made of rubber.
7.both have hilarious weakness.