CSR is the easiest single card to keep, assuming you spend enough on travel to hold any premium cards. Plus it makes your Freedom Unlimited points more valuable.

I have a tough time justifying the Bonvoy Brilliant, though you might find the free night worth the fee. Given the rewards structure and price you’d have to spend a LOT of time at a Marriott for it to be a worthwhile return on spend compared to the other cards.

You should evaluate your own spend and fly habits regarding the Delta card, but I’ll be dropping mine with the recent benefit changes as I don’t think the MQD waiver is necessary for me to hit the lower status levels and I’ll never hit the Diamond $250k spend.

I love my AmEx Plat benefits and with the upcoming addition of travel insurance it’ll be even better for buying airline tickets, and for Delta flyers it includes SkyClub access. But it’s definitely pricey if you can’t extract value from the various credits, so look at whatever effective fee you have to pay and decide if that’s worth the lounge access and hotel status. It’s certainly not good for spending on anything besides airlines...