I like having my Amex Platinum with my everyday preferred. If the preferred is your daily, you'll hit the 50% point bonus after after 30 purchases in no time. That means a minimum of 1.5 points of purchases, 4.5 points on groceries, and 3 points on gas. You do miss out on the restaurant bonus category with this set up though. So consider you'll only get 1.5 points on restaurants and that might not be enough for you if it's a heavy spending category.