3. Obviously
Lord Madara, don't care if it was forced. He brought upon the world true peace. As of now in NV there are still otsutsuki bandits who at any day could harm the shinobi world. So Naruto really didn't bring peace, he may have brought it upon the five great nations, but not the whole world.
Asspull saved the NV. Kaguya was unbeatable and had to be netted by ghost asspull.
I know. I know. We all know. Kaguya should've been unstoppable for sure. In fact, she practically had enough chakra to overpower that yin-yang seal. No seal should work twice on the same person.
Who saved the shinobi world?
1. Naruto
2. Sasuke
3. Naruto & Sasuke
4. Lord Madara
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Manga fact.
Manga stated Kurama and Naruto. So I guess those two are the ones that did all the work since nobody else got any credit.