Of course One Piece is more important!
I kinda like how the anime decided to give one or two episodes to the side-storys iinstead of the coverpages. That gets you more into it. Like I don't care one bit about Coby and Helmebbo after one page.
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Presenting a great man. The one and only of his kind. Dudes and dudettes, it's an honor to give you... CTES... umm... well... oh whatever.