Every weekday, I drive across the county line into Montgomery County on my way to work, and every night I drive back across into Frederick County. Frederick County tends conservative, Montgomery is known as The People's Republic of Montgomery County. As you enter Frederick County, the sign at the county line says "Welcome to Frederick County." The sign put up at the county line by Montgomery County says "Traffic Laws Are Photo Enforced."
I think that tells you everything you need to know about the two.