I have both, and end up putting 60% of my spend on SPG Amex (Starwood hotels for sure, and then anything generic), 10% (Amazon) on the Amazon Chase Prime Visa (

I have both, and end up putting 60% of my spend on SPG Amex (Starwood hotels for sure, and then anything generic), 10% (Amazon) on the Amazon Chase Prime Visa (5% back...), 20% (dining and other bonus categories, merchants that don't take amex) on the Chase Sapphire Reserve, and VX on the VX credit card, IHG on IHG card, UA on UA card, etc. Amex Platinum (MR) has pretty bad values for point redemption -- it's a good card to have for access to lounges and for certain airline tickets, but it's generally not the best return for most purchases. If you're eligible, there's a 2.5% back USAA credit card which is probably the cash-back winner, otherwise SPG seems to win for value, but I've seen some 5-7% return cases for the CSR too (Asian mileage tickets in C or F). There's also the fact that personal Amex PLT is $550/yr (now), with ~$200/yr in Uber reimbursements spread out over the year and a few other things. The biggest benefit of PLT is the Centurion Lounge, which for US domestic travel is nice if you're in those airports, but for international it's Priority Pass Select on both CSR and PLT. CSR is $450/yr with $300/yr in credit for virtually any travel, so it's net $150/yr. PP Select is worth that alone, and a bunch of other benefits. I'd drop Amex Platinum if I wanted to drop a card (and I actually just have the OPEN Small Business version; I don't have a personal PLT).