US Mobile serves as my data eSIM, where it gives me unlimited hotspot 20GB of roaming/month. Previously I bought eSIMs when traveling since T-Mobile is only 5GB/mo hotspot/roaming and earlier at 256 Kbps.
T-Mobile is better for calls and international texts, due to it being unlimited. I also prefer keeping a non-MVNO as my call/text number so I can go to a T-Mobile store and activate a spare phone if I lose mine (which I never did), or my phone fails. With US Mobile, I'm not sure how I'd recover a lost phone.
Since the Pixel 10 Pro lacks a SIM card slot, this is important. But hey, I used my Pixel 3 on Sprint with eSIM; I went T-Mobile 3 months before they merged.
US Mobile has done well with me, although anything not-T-Mobile is really slow nowadays.