If you are looking for no fuss (and no bloatware), check out Fairphone. They provide OS updates for at least 5 years, and with the last one they say it will receive updates for even longer.
Of note that if you're from the US, you cannot buy it I think. They don't offer versions with the hardware for the networks you use over there, only for the rest of the world.
I've seen people say that the Murena version uses the exact same modem as the original Fairphone one. This means you'll get connectivity issues if you use it in the US, which is likely why Fairphone themselves don't sell in the US.