Suggested by Destroyer Natsu and Naruto are both extremely powerful fighters but only one can win. While Natsu continues to get stronger at a rapid pace while Naruto hasn’t moved in a while, Naruto did gain his Baryon Mode which should be more than a match for Natsu’s Dragon King form. Naruto has the edge in speed and strength plus he doesn’t use fire abilities so there’s no chance of powering up Natsu by mistake. Naruto wins.