I have both the savings and Money Market, the Money Market is definitely the better choice unless:
* you have less than $10k balance
* you move money in/out of the account too many times per month (6 total transactions/month, IIRC)
I have my roughly $14k in my Money Market right now, and the 360 Savings still open, with a zero balance. If anything came up that requires me to tap into my emergency fund that brought the balance below $10k, I just transfer the balance to the Savings until the balance gets back up past $10k.