Discover only for me. I have credit, debit and savings there. There are websites with surveys you can fill out that tell you the best card based on your spending and reward preferences.
My Discover setup:
Everyday expenses like groceries, gas, shopping on credit and paid in full monthly. Once we get within $200 of our monthly limit I tell my wife to quit shopping until the billing period ends.
I setup monthly fixed expenses in a debit account to automatically transfer fixed amount from main local bank. Car and life insurance, mortgage, Alliant, 529's, Roth IRA. Update this once every 6 months when Alliant changes the new budget billing and once a year for mortgage. Only other thing that changes is car insurance moving a buck or two in either direction.
Use the savings for emergency fund as it's generally one of the best % nationally.