Ah. I couldn’t figure out why you felt the way you did.
Around here, the County Sheriff (head of the Sheriff’s Department) is an elected position. That’s supposed to give the citizens input in the direction and policies of the department. Police Chiefs are usually appointed by the City’s Mayor. In my previous city, the Police Department has been going through a series of scandals off and on for decades (rogue elements planting evidence, multiple officers having sex with a minor, tipping off that minor, excessive force, etc). The Police Department has a Court-mandated manager monitoring its behavior. By contrast, the Sheriff’s Department has had only one major scandal (signing a contract with a health care provider without sending it out to bid).
The departments have very different tasks with the sheriffs only providing non-traffic-related policing in unincorporated areas (non-city) and staffing the county jail. While some of that unincorporated area is suburban, most is fairly rural. The population density is lower and the ethnic mix is less diverse.
I always thought they should merge the PD for my former city with the Sheriff’s Department, but some of the surrounding suburbs would probably object. There is no hint that anyone else ever agreed with me. And the court system has not even hinted that they’d want to force a merger.