Which is better for My dog? AvoDerm or Taste of the wild?

I am currentley feeding my 2year old Dogo Argentino 3 cups a day of AvoDerm (Chicken & Brown Rice Formula Adult Dog Food). Im wondering if Taste of the Wild High (Prairie Canine Formula with Roasted Bison and Roasted Venison) is better for her, i would be feeding her less (about 2 cups a day) and it would last me longer, 54 days with a 30lbs. of Taste of the Wild bag vs.41 days with a 35lbs. bag of AvoDerm. They cost me about the same ($45)