I just got my Galaxy S9 within the past week. I am running SCP. The results are interesting. It seems to stay stable on Sprint B25, but it does see on the report some other B25,B26 and sometimes a B41 neighbor cells all with only slightly higher negative numbers.
This is all when WiFi is disabled on the S9. My WiFi is 5 GHZ running anywhere from 260 Mps to 650 Mps. I have for short periods seen WiFi faster speeds.