Money market funds are not FDIC insured. When the GSEs go through all that predicted systemic risk , what will be the value of your money market?
So what if the CD has a penalty for early withdrawal? Have you asked what is that penalty? It is usually the loss of 1 month of interest. But never the loss of principal.
The money market does have a risk of loss of principal. They say it has never happened, but they cannot tell you it never will. Maybe the odds are low. Does anyone know the odds of a money market losing principal?