Favorite TV series

Of all time? Easy one for me. The Dick Van Dyke Show.

Law & Order. I've always liked this show and all of its spin offs.

Tie

Seinfeld
Star Trek TOS

The Shield or Magnum P.i.

Upstairs, Downstairs (1971-75)
Fawlty Towers (1975-79)
Yes Minister / Yes Prime Minister (1980-86)
Brideshead Revisited (1981)
Agatha Christie's Miss Marple (1984-1992)
The Singing Detective (1986)
Inspector Morse (1987-2000)
Agatha Christie’s Poirot (1989-2013)
Middlemarch (1994)
Pride and Prejudice (1995)
Our Mutual Friend (1998)
Once and Again (1999-2002)
Wives and Daughters (1999)
Band of Brothers (2001)
The Wire (2002-08)
Battlestar Galactica (2003-09)
Bleak House (2005)
Fingersmith (2005)
ROME (2005 & 2007)
Jane Eyre (2006)
The Tudors (2007-10)
In Treatment (2008-10)
Little Dorrit (2008)
Breaking Bad (2008-13)
Endeavour (2012-2021)
Belgravia (2020)
The Queen's Gambit (2020)

When I was kid it was Batman: The Animated Series

As I got older it was Buffy & Angel but as of right now Justified is still is my favorite show

I'll go with ones I've actually sought out to rewatch;

24
Law & Order
Medium
Wire In The Blood
Only Fools and Horses
The Vicar of Dibley.

"Firefly"
but you can only watch your very bestest favorite so many times , then you have to let it lie fallow for 20 years .