Opinion:

There is no doubt in my mind that George Jones is the best living country singer. Before "He stopped Loving Her Today," his best song (in honky tonk beer joint circles) is "The Window Up Above."

Hank Williams tops the dead guys with Lefty Frizzell right behind him.
"Cold Cold Heart" is my favorite, but there is a dozen others almost as good.

Lefty's best effort, I think, is "Long Black Veil." He has a string of super songs he did in the fifties.