Brian’s Song starring James Caan and Billy Dee Williams

Personally, I'd say the best was Duel (starring Dennis Weaver).

Also up there would be Escape from Sobibor (Rutger Hauer).

Another favorite, although most people wouldn't include it because it compares unfavorably it to the original theatrical release, is 12 Angry Men (Jack Lemmon, George C. Scott).

I suppose I'd say they don't really feel relevant any more because the best ones will come from streaming services, so won't really be considered 'tv movies' although they still would be.

edit- Brian's Song, as mentioned by ray_0856, is another good one. I was trying to remember it, and could only come up with Bang the Drum Slowly, which was a theatrical release)

I Know My First Name is Steven

Small Sacrifices

The Burning Bed

David

A Woman Scorned: The Betty Broderick Story

A Cry for Help: The Tracy Thurman Story

Voices Within: The Lives of Trudie Chase

Big Dreams and Broken Hearts: The Dottie West Story

I think the time is ripe for one of the old timey networks to bring back the movie-of-the-week. Paging Michele Lee!

Conspiracy 2001 - on HBO. Incredible film all taking place in the same room. Nazi officials meeting to discuss "Final Solution of the Jewish Question" during World War II.

Soderbergh's Behind The Candelabra. The Liberace movie with Michael Douglas and Matt Damon.

By Dawn's Early Light.

An accidental nuclear exchange leads the world to the brink.

Starring Darth Vader himself, James Earl Jones.. Plus Martin Landau, Rebecca de Mornay, Powers Booth. A brilliantly tense movie.

When trumpets fade, WW2 movie.

Brotherhood of the Rose

Citizen X.

A very good tv film about a serial killer in the Soviet Union, based on a real story.

Lonesome Dove

Stretch was really good, starring Patrick Wilson and Chris Pine