Hoopa unbound question

I am just curious. What advantage is there to changing the form of Hoopa that would warrant spending the candy and Stardust on it? Is the unbound form of Hoopa stronger? Or is this just appearance?

In the main series games, hoops unbound was an absolute powerhouse (looking at both attack stats). In pokemon go, not so sure

Found something on it though, this might help you in deciding wether you want to do it or not