Advertisement I see both Purina and Iams Cat food in stores around here and being a new cat owner and short on cash I cannot afford to pay tons of money for cat food. Which is the better of the two? They are both affordable for me. I am disabled but forced to work and they only pay me $7.45/hr and I get less than 15 hours a week. Is there any specific foods Iams or Purina makes I should use?