If you are planning on making a big purchase, there are a few options to consider. A big purchase on the Marriott Bonvoy Brilliant could bring you closer to more benefits, like Platinum Elite Status. This status means cardholders will have access to room upgrades, welcome gifts at check-in, 50% bonus points on stays, and more at Marriott Bonvoy properties.
Essentially, if you are going to make a big purchase, choose the card that makes the most sense for you. If you want the flexibility to travel, the Chase Sapphire Preferred is a good card to go for. If you fly Delta often, the Platinum Delta or Delta Reserve are good options since they earn plenty of miles and come with plenty of benefits.