I have only played 2 One Piece games.
The first was on the Vita and had this lovely little town to explore and build up between missions.
The other was basically a full on musou game where you just ran around areas capturing points - almost identical to the DW series. I don't remember it's name, but I do not recall it having a hub world.
My 8 year old son loved the Vita version because it also had the Arena mode where you ranked up and could unlock extra characters by achieving certain goals.
So is this one like the Vita version, or pure musou?
Cheers.