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Why is there so much variability on interest rate accounts
Generally, if you watch for the detail in the fine print, and stay away from non-FDIC insured investments, there is little difference, so yes, pick the highest you can get. The offered interest rate is influenced by what the banks are trying to accomplish, and how their current and desired customer base thinks. Some banks have customer bases with very conservative behavior, which will stick with them because they trust them no matter what, so a low interest rate is good enough. The disadvantage for the bank is that such customers prefer brick-and-mortar contact, which is expensive for the bank. Or maybe the bank has already more cash than they need, and has no good way to invest it. Other banks might need more cash flow to be able to get stronger in the mortgage market, and their way of getting that is to offer higher interest rates, so new customers come and invest new money (which the bank in turn can then mortgage out). They also may offer higher rates for online handling only. Overall, there are many different ways to make money as a bank, and they diversify into different niches with other focuses, and that comes with offering quite different interest rates.