How do you determine if you have Barium Iodide or Barium Bromide?

Ok. So in chemistry we had to do this lab where we determine a the chemical formula for an unknown white inorganic compound. I know it has barium because of a flame test i did, and have narrowed it down to either BaI2 or BaBr2(simple solubility tests), but I don't know how to figure out which one it is. Help!!!