Best TV show of all time?

Married with children.

Monty Python

Comedy
Fleabag
The Office US
Rick and Morty
BoJack Horseman
Barry
The Marvelous Mrs. Maisel

Drama
The Wire
Breaking Bad
Better Call Saul
Death Note
Band of Brothers
Game of Thrones
Andor
Psycho-Pass S1

Honorable mentions
Baby Reindeer
Peacemaker
Travelers
The Walking Dead S1
Firefly
Fallout
Altered Carbon S1
Killing Eve S1

Narrative: One Piece. It's been airing for 25? years now and despite the pacing problems its had (fishman island thru dressrosa had issues, I consider everything after fine), I still look forward to watching every new episode. By simple virtue of adapting what I consider the most epic modern work of fiction, it wins.

Variety: Saturday Night Live. No doubt here; it has a similar pedigree (50 years!) and though it's fallen out of favor here and there, it's the largest comedy work in history and I dare say never actively bad, just less good at times.

Depends on what mood I'm in, but its either Mr Robot or True Detective (season one).

The Sopranos Breaking Bad Game of Thrones

Rome (HBO). I rewatch it every year or two and it still holds up after 20+ years

Lost

Babylon 5 and Battlestar Galactica were pretty good too

There can only be one? That Highlander series was pretty bad.

Too complicated for only one.

Looney Tunes
X-Men The Animated Series
The Simpsons
Batman The Animated Series
Animaniacs
Robotech
Saint Seiya
Dragon Ball (Nothing beats Goku as a kid. Japanese, english and spanish language is good).
Ranma 1/2 (Latino dub)
The Maxx
Jackass
Wildboyz
Crank Yankers
Wonder Showzen
Neon Genesis Evangelion

X-files (first season)
Married with Children
24 (first season)
Star Wars: Andor
The Mandalorian (first season)
Euphoria (Thanks Xarabas).
Narcos: México (as much as this hurts internally)
Fallout
True Detective (first season).
Walking Dead (first seasons)

I may have missed many things I can't recall. I havent seen a lot of stuff that's like the Holy Grail of series, like Breaking Bad, Game of Thrones, Better Call Saul and probably never will because they're huge already.