Charles Schwab offers 8 money market funds. Which one is the best for you depends on your risk preference and your federal and state tax brackets.
Which Fidelity Money Market Fund Is the Best at Your Tax Rates
Fidelity offers 18 money market funds. Which one is the best for you depends on your preference for convenience and your federal and state tax brackets.
Which Vanguard Money Market Fund Is the Best at Your Tax Rates
Vanguard offers six money market funds. Which one is the best for you depends on your preference for convenience and your federal and state tax brackets.
Traditional >= Roth >= Taxable
A taxable account should still be the last resort. Max out all tax-advantaged accounts before investing in a taxable account.