For the first time in MANY years, Vanguard money market funds pay higher rates than most bank savings accounts. The higher wholesale money market rates reflect quickly in the Vanguard fund, as the rates they get are passed along. Bank posted rates can stay low if a bank sees their customer base as inattentive, and they want to increase profit margins.
But the lower yield one is the standard- you have to specifically buy SPRXX to get the higher rate
https://investor.vanguard.com/investment-products/mutual-funds/profile/vmfxx