Would a CD account or a money market account be more profitable?

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I am not a risk taker, like those people rather invest their money in stock market, and earn big bucks if they win. I am more toward the conservative side, and want to see the money grow in a traditional way. Deposit in a bank of saving account. Like CD, if you are sure that you won't need a certain amount for period of time, then it is a great choice for you. What about money market account provided by your bank. It tends to have higher interest rate too. Which one would be the better choice, CD account or a money market account?