Back when interest rates were high, I had just one account. I had a money-market checking account that offered good interest rates and unlimited check writing. But those days are long gone.
I want as high an interest rate as I can get for my savings. In order to get those rates, I am using a money-market savings account. All such accounts I’ve seen restrict the number of transactions I can make in a month. I need to be able to pay bills, no matter how many of them there are — and I never ever want to pay fees for excess transactions!
So I have a separate checking account. It pays less than half the interest rate of my savings account, but I can make as many transactions as I want. The bank offers a bill pay application that I use for most payments, and I can write as many checks as I want to. I can transfer money between the accounts quickly.