Google FI is a bit more expensive since their QCI level is the same as T-Mobile's first-party premium plans, so theoretically you won't be slowed down if the T-Mobile tower handling your data is overloaded, while T-Mobile "Essentials" and other MVNOs using T-Mobile will be slowed down. https://fixverizon.com/2023/01/12/qci-prioritization-for-car...