I booked my stay at the cosmopolitan thru the Marriott website. I booked using my amex platinum card. However, I do have an amex spg card as well. I wanted to know which card should I be using to get the most points/benefits for my stay? My Plat card gave me gold status with Marriott rewards.
Credit cards will continue to link to the program they're associated with, and you will continue to accumulate points with that program.
Once you’ve linked accounts, you can transfer points earned through your credit card in one program to another program. If you’ve earned Elite night credits through your credit card, you can’t transfer those. However, if your card has given you Elite status, that status can be applied across programs through Status Match.