You will be treated the same at Ritz Carlton with either Marriott Rewards Platinum Status or Ritz Carlton Rewards Platinum Status. The rewards program are essentially the same. The only difference is Ritz Carlton Rewards members will receive different Mega Bonus type promotions for Ritz stays. Also keep in mind that Club Level access is not included as a Platinum benefit at Ritz. However the Ritz credit card does offer 3 annual free upgrades certificates to club level each year.