Madara, only because of his sense of battle. He grew up inside of the Warring Clans Era, so he's just suited for fighting. His mentality only progressed into the self-centered, power-thirsty Madara we see today. On the other hand we have Naruto, who only fought to protect his friends. Though Love is triumphant over Power, Madara simply has more experience. Madara has lived one life-time through, and lived again. But I'm just going off the details, who actually knows who's would win.