Straight talk & phones..?

Morgan
So I'm thinking of switching to straight talk. (My husbands phone uses 15gb and then some a month making our bill outrageous right now and we can't afford that.) but I'm thinking it's his Samsung note 4 phone. When he had an iPhone it never wasted that much data. Does anyone know how to get the best phones for straight talk, and what your opinions are on it? I would appreciate it! Thanks!!