I have the 6. I set my phone to prefer LTE to gain HOURS of battery life and to get a more stable connection. I always have an issue where the phone may take a minute after pressing call to actually initiate a phone call.
My next phone is probably going to be OnePlus. Either the 6T on PostMarketOS if it actually works or just the latest cheaper model (but I'll wait till the 13, the 6 is only like 2.5 years old).