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I'd compare 5.21% to 5.05% -- both are after compounding.
If you are going to have money floating around and some of it is at Vanguard, you might as well put all your emergency fund there as well. You will have a larger number which helps at Vanguard to avoid other fees. You will have an easier/quicker time of exchanging into Vanguard funds from Vanguard Prime MMF. You can write checks on the MMF as well. Indeed, I can write a check to myself and deposit it in person to my WellsFargo checking account and WF puts no hold on that check for me.
So better benefits and a higher interest rate means Vanguard to me.
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