Octet Rule vs. Formal Charge

[Blake_Panter_3D]

When drawing Lewis Dot Structures, is it preferred by a molecule to have all of the atoms have an octet, or for all of the formal charges to be 0, if you cannot have both? For example, for the Lewis Structure of BrO-, why is there only a single bond between the two atoms with the formal charge of O being -1 when it could be 0 if there was a double bond, making Br have an expanded octet?

[Vista_Farkhondeh_3O]

I believe the first priority is to make sure the formal charge is zero. Then, if you are able to form octets without compromising the formal charge you should do so.