Preferred network type

I use a T-Mobile MVNO (Mint Mobile) and I see 5G very frequently in my local area about 12 miles east of Hartford, CT.

My best speed test to date was 179 down and 26 up, although I avoid speed tests, due to only having 4GB of data.
 
I usually see 5G UC on my phone with speeds of 400-500 Mbps. Occasionally I see 5G or 4G LTE. The LTE is quite a bit faster than 5G. 5G UC is a different signal than 5G. This is on T-Mobile.