One piece had a very clear advantage in part 1 but the lines have blurred in the past 10 years or more. atleast in part 2 Kishi had very good fights and introduced some good characters like madara tobi and danzou to name a few. he did some characters dirty like A and the mizukage but post timeskip Oda has failed to make really good characters or storylines. I think Naruto would be a more interesting reread than One piece if were talking about the entierty. But if your including boruto than One Piece still wins.