I use mine for everyday spend
Amex Gold for travel purchased directly through airlines would be 3X MR points. If you value MR over UR, supermarkets could go on either Amex card and fuel and restaurants (when not 5% Freedom categories) could go on PRG for 2X MR.
My primary rewards system is Marriott, so I'm currently using Amex SPG (1 SPG = 3 Marriott points per $, more for charges at Marriott) for almost everything unless it's 5% straight cash back (restaurants on Discover it and targeted Citi Diamond Preferred offer right now), 5% Chase Freedom (exhausted $1500 cap this quarter on restaurants, but 5% back = 5 UR points transferred to CSP = 5 Marriott points), flights booked directly with airlines (5 MR = 1.67 SPG = 5 Marriott points per $), and the odd transaction that I can't use an Amex on goes on CSP (2 UR travel and dining = 2 Marriott points, 1 UR elsewhere = 1 Marriott point). Other than switching spend for signup bonuses where the net reward is higher than 5%, that's been my strategy for the past 5 months and I've racked up something like 270,000 Marriott points already (have cashed out a few times for effectively about 2 cents per Marriott point)!
This quarter I'm using:
Amazon for 5% at Amazon, and 2% at Drug Stores.
US Bank Cash + for 5% on Cellular Phone, and 5% at Electronic Stores.
Amex BCP for 6% at Grocery stores, and 3% at Department stores.
Chase Freedom for 5% at Movies, and 5% at Resturaunts.
Sams Club for 5% on Gasoline.
Amex Hilton if I go to a hotel, but otherwise in the sock drawer.
Discover It it hanging in the sock drawer this quarter as well,
Everything else goes to my Chase Sapphire Preferred.
I need a cheat sheet in my wallet.
