I voted OP beace the poll says OP vs LOTR, not OP vs LOTR + Silmarillion + Hobbit + The Children of Hurin + Unfinished Tales and The History of Middle-earth + whatever else Tolkiens offsprings decided do publish decades after his death...
Sure, Tolkiens lore is much more vast and rich than that of Oda, but LOTR itself only touches a small percentage of it. Oda could also decide to write a bible of OP world that spans from the creation of the world to the current story, squishing a thousands of years of events and overload of characters into a few pages, without fleshing out any of them, so that way they could compete in the sheer quantity of information I guess.