Naruto or One Piece?
Depends. I mean Naruto started off a lot better than One Piece did. But then again One Piece at times did things a lot better than Naruto did. The real hard time I can't decide is between Dressrosa, and The Pain Invasion. If I had to pick which was better, I'd say The Pain Invasion due to how it started a huge onslight of great things to come to anime in the 2010s. After The Pain Invasion we got Madoka, Hunter x Hunter 2011, Kill La Kill, Space Dandy, Sword Art Online, and so on.