I have a lot of TV and movie soundtracks & scores in my music collection- ignoring the musicals- and of course some that I haven’t added…yet. TBH, I don’t think in terms of favorites anymore.
I thought the original theme from Monk was classic. And Jan Hammer’s work on Miami Vice is stellar. X-Files is pretty good.
Some from my childhood still resonate with me: The Rockford Files, Kolchak The Night Stalker, The Streets of San Francisco, Ironside, Baretta, Kung Fu, Columbo…
Mission Impossible deserves a special mention because Lalo Schifrin composed it using Morse Code to determine its rhythmic structure.