My understanding is that Google Fi is a glorified T-Mobile MVNO at this point (i.e. you're a Fi customer but using T-Mobile towers). It used to give you the closest/best connection of T-Mobile, Sprint, or US Cellular, but Sprint no longer exists, and T-Mobile bought US Cellular.
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My understanding is that Google Fi is a glorified T-Mobile MVNO at this point (i.e. you're a Fi customer but using T-Mobile towers). It used to give you the closest/best connection of T-Mobile, Sprint, or US Cellular, but Sprint no longer exists, and T-Mobile bought US Cellular.
They also merged with Sprint. So maybe not much difference ?